Illustration to show that the difference of the distances from any point in the base produced of an isosceles triangle to the equal sides of the triangle is constant.

Point in Base of Isosceles Triangle

Illustration to show that the difference of the distances from any point in the base produced of an…

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three sides is constant, and equal to the altitude.

Perpendiculars Dropped Any Point in the Equilateral Triangle

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three…

Illustration to show lines drawn from the vertices to join at a point within the triangle.

Triangle With Lines From the Vertices That Join a Point Within

Illustration to show lines drawn from the vertices to join at a point within the triangle.

Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs are drawn, a parallelogram is formed whose perimeter is constant, being equal to the sum of the legs of the triangle.

Isosceles Triangle With Parallelogram inside

Illustration to show that if from any point in the base of an isosceles triangle parallels to the legs…

Illustration to show the bisector of the vertical angle A of a triangle ABC, and the bisectors of the exterior angles at the base formed by producing the sides AB and AC, meet in a point which is equidistant from the base and the sides produced.

Triangle With Bisectors of Vertical Angles

Illustration to show the bisector of the vertical angle A of a triangle ABC, and the bisectors of the…

Illustration to show if the bisector of the base angles of a triangle are drawn, and through their point of intersection a line is drawn parallel to the base, the length of this parallel between the sides is equal to the sum of the segments of the sides between the parallel and the base.

Triangle With Bisectors of Base Angles

Illustration to show if the bisector of the base angles of a triangle are drawn, and through their point…

Illustrations of a circle with secant AD and line BC tangent to it.

Circle with Secant and Point of Tangency

Illustrations of a circle with secant AD and line BC tangent to it.

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point are equal, and make equal angles with the line joining the point to the center.

Circle With Two Tangents Drawn From an External Point

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point…

Illustration of two circles that are tangent to each other, the line of center passing through the point of contact.

Tangent Circles

Illustration of two circles that are tangent to each other, the line of center passing through the point…

Illustration of a circle showing an angle included by a tangent and a chord drawn from the point of contact. The angle is measured by half the intercepted arc.

Circle With Chord and Tangent

Illustration of a circle showing an angle included by a tangent and a chord drawn from the point of…

Illustration showing angles formed by two secants, two tangents, or a tangent and a secant, drawn to a circle form an external point. The angle is measured by half the difference of the intercepted arcs.

Circles With Angles Formed by Secants and Tangents

Illustration showing angles formed by two secants, two tangents, or a tangent and a secant, drawn to…

Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact terminated by the circumference. The chords joining the ends of theses lines are parallel.

Tangent Circles With Chords

Illustration showing 2 circles with that touch each other and two lines drawn through the point of contact…

Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated by the circumferences. The chords joining the ends of theses lines are parallel.

Two Intersecting Circles With Lines

Illustration showing 2 intersecting circles with a line drawn through each point of intersection terminated…

Illustration where one leg of a right triangle is the diameter of a circle. The tangent at the point where the circumference cuts the hypotenuse bisects the other leg.

Circle With a Right Triangle

Illustration where one leg of a right triangle is the diameter of a circle. The tangent at the point…

Illustration showing that from any point in the circumference of a circle, a chord and a tangent are drawn, the perpendiculars dropped on them from the middle point of the subtended arc are equal.

Circle With a Tangent Line and Chord

Illustration showing that from any point in the circumference of a circle, a chord and a tangent are…

Illustration to let fall a perpendicular upon a given line from a given external point.

Construction of Perpendicular Upon a Given Line From an External Point

Illustration to let fall a perpendicular upon a given line from a given external point.

Illustration of the construction of a perpendicular to a line when given a point O on the straight line.

Construction of Perpendicular From a Given Point on a Straight Line

Illustration of the construction of a perpendicular to a line when given a point O on the straight line.

Illustration of the construction of a perpendicular to a line when given a point B on the straight line.

Construction of Perpendicular From a Given Point on a Straight Line

Illustration of the construction of a perpendicular to a line when given a point B on the straight line.

Illustration of the construction used to create an equal angle given a point in a given straight line and a given angle.

Construction of an Equal Angle Given a Point and a Straight Line

Illustration of the construction used to create an equal angle given a point in a given straight line…

Illustration of the construction used to create straight line parallel to a given straight line through a given external point.

Construction of a Straight Line Parallel to a Given Straight Line

Illustration of the construction used to create straight line parallel to a given straight line through…

Illustration of the construction used to draw a tangent to a given circle through a given point.

Construction of Tangent Line Through a Given Point to a Given Circle

Illustration of the construction used to draw a tangent to a given circle through a given point.

Illustration used to construct a circle that shall pass through a given point and cut chords of a given length from two parallels.

Construction of a Circle Through a Given Point that Cuts Chords of Given Lengths From Parallels

Illustration used to construct a circle that shall pass through a given point and cut chords of a given…

Illustration used to construct a circle when given two points that it passes through and a radius.

Construction of a Circle When Given Two Points and a Radius

Illustration used to construct a circle when given two points that it passes through and a radius.

Illustration showing a line with a midpoint drawn from a given exterior point to a given circumference.

Midpoint of Straight Line Drawn From an Exterior point to Circumference

Illustration showing a line with a midpoint drawn from a given exterior point to a given circumference.

Anterior view of humerus (bone of the leg) of the right side. Labels: 1, shaft or diaphysis; 2, the head; 3, anatomical neck; 4, greater tuberosity; 5, lesser tuberosity; 6, the bicipital head; 3, anatomical neck; 4, greater tuberosity; 5, lesser tuberosity; 6, the bicipital groove; 7, external bicipital ridge for pectoralis major; 8, internal bicipital ridge; 9, point of insertion of deltoid muscle: 10, nutritious foramen; 11, face for head of the radius; 12, face for the ulna.

Humerus

Anterior view of humerus (bone of the leg) of the right side. Labels: 1, shaft or diaphysis; 2, the…

Deep-seated muscles on the posterior part of the hip joint. Labels: 1, fifth lumbar vertebra; 2, ilio-lumbar ligament; 3, crest of the ilium; 4, anterior superior spinous process; 5, origin of the fascia femoris; 6, gluteus medius; 7, its lower and anterior portion; 8, pyriformis; 9, gemini; 10, trochanter major; 11, insertion of the gluteus medius; 12, gradratus femoris; 13, part of the adductor magnus; 14, insertion of the gluteus magnus; 15, vastrus externus; 16, long head of the biceps; 17, semi-membranosos; 18, semi-tendinosus; 19, tuber ischii; 20, obturator internus; 21, point of the coccyx; 22, posterior coccygeal ligament; 23, 24, greater sacro-sciatic ligament; 25, posterior superior spinous process of ilium; 26, posterior sacro-iliac ligaments.

Deep Muscles of the Hip Joint

Deep-seated muscles on the posterior part of the hip joint. Labels: 1, fifth lumbar vertebra; 2, ilio-lumbar…

Arteries of the pelvis and thigh. Labels: 1, inferior extremity of abdominal aorta; 2, right primitive iliac; 3, right external iliac; 4, epigastric artery; 5, circumflex illii; 6, internal ilic; 7, ileo lumbar; 8, gluteal; 9, obturator; 10, lateral sacral; 11, vesical arteries cut off; 12, middle hemorrhoidal; 13, internal pudic; 14, ischiatric; 15, origin of femoral artery; 16, point where it passes through the adductor muscles; 17, profunda major; 18, internal circumflex.

Arteries of the Pelvis and Thigh

Arteries of the pelvis and thigh. Labels: 1, inferior extremity of abdominal aorta; 2, right primitive…

Superficial veins of the upper extremity (arm). Labels: 1, axillary artery; 2, axillary veins; 3, basilic vein; 5, point where the median basilic joins the basilic vein; 9, point where the cephalic enters the axillary vein; 11, point where the median cephalic centers the cephalic vein; 12, lower portion of the cephalic vein; 14, median vein; 15, anastomosing branch; 16, cephalicapellicis vein; 17, subcutaneous veins of the fingers; 18, subcutaneous palmar veins.

Veins of the Arm

Superficial veins of the upper extremity (arm). Labels: 1, axillary artery; 2, axillary veins; 3, basilic…

Bilingual Counting Card featuring an illustration of one Starfish.

Bilingual Starfish Counting Card 1

Bilingual Counting Card featuring an illustration of one Starfish.

Bilingual Counting Card featuring illustrations of two Starfishes.

Bilingual Starfish Counting Card 2

Bilingual Counting Card featuring illustrations of two Starfishes.

Bilingual Counting Card featuring illustrations of three Starfishes.

Bilingual Starfish Counting Card 3

Bilingual Counting Card featuring illustrations of three Starfishes.

Bilingual Counting Card featuring illustrations of four Starfishes.

Bilingual Starfish Counting Card 4

Bilingual Counting Card featuring illustrations of four Starfishes.

Bilingual Counting Card featuring illustrations of five Starfishes.

Bilingual Starfish Counting Card 5

Bilingual Counting Card featuring illustrations of five Starfishes.

Bilingual Counting Card featuring illustrations of six Starfishes.

Bilingual Starfish Counting Card 6

Bilingual Counting Card featuring illustrations of six Starfishes.

Bilingual Counting Card featuring illustrations of seven Starfishes.

Bilingual Starfish Counting Card 7

Bilingual Counting Card featuring illustrations of seven Starfishes.

Bilingual Counting Card featuring illustrations of eight Starfishes.

Bilingual Starfish Counting Card 8

Bilingual Counting Card featuring illustrations of eight Starfishes.

Bilingual Counting Card featuring illustrations of nine Starfishes.

Bilingual Starfish Counting Card 9

Bilingual Counting Card featuring illustrations of nine Starfishes.

Bilingual Counting Card featuring illustrations of ten Starfishes.

Bilingual Starfish Counting Card 10

Bilingual Counting Card featuring illustrations of ten Starfishes.

English Counting Card featuring an illustration of one Starfish.

English Starfish Counting Card 1

English Counting Card featuring an illustration of one Starfish.

English Counting Card featuring illustrations of two Starfishes.

English Starfish Counting Card 2

English Counting Card featuring illustrations of two Starfishes.

English Counting Card featuring illustrations of three Starfishes.

English Starfish Counting Card 3

English Counting Card featuring illustrations of three Starfishes.

English Counting Card featuring illustrations of four Starfishes.

English Starfish Counting Card 4

English Counting Card featuring illustrations of four Starfishes.

English Counting Card featuring illustrations of five Starfishes.

English Starfish Counting Card 5

English Counting Card featuring illustrations of five Starfishes.

English Counting Card featuring illustrations of six Starfishes.

English Starfish Counting Card 6

English Counting Card featuring illustrations of six Starfishes.

English Counting Card featuring illustrations of seven Starfishes.

English Starfish Counting Card 7

English Counting Card featuring illustrations of seven Starfishes.

English Counting Card featuring illustrations of eight Starfishes.

English Starfish Counting Card 8

English Counting Card featuring illustrations of eight Starfishes.

English Counting Card featuring illustrations of nine Starfishes.

English Starfish Counting Card 9

English Counting Card featuring illustrations of nine Starfishes.

English Counting Card featuring illustrations of ten Starfishes.

English Starfish Counting Card 10

English Counting Card featuring illustrations of ten Starfishes.

Spanish Counting Card featuring an illustration of one Starfish.

Spanish Starfish Counting Card 1

Spanish Counting Card featuring an illustration of one Starfish.

Spanish Counting Card featuring illustrations of two Starfishes.

Spanish Starfish Counting Card 2

Spanish Counting Card featuring illustrations of two Starfishes.

Spanish Counting Card featuring illustrations of three Starfishes.

Spanish Starfish Counting Card 3

Spanish Counting Card featuring illustrations of three Starfishes.

Spanish Counting Card featuring illustrations of four Starfishes.

Spanish Starfish Counting Card 4

Spanish Counting Card featuring illustrations of four Starfishes.

Spanish Counting Card featuring illustrations of five Starfishes.

Spanish Starfish Counting Card 5

Spanish Counting Card featuring illustrations of five Starfishes.

Spanish Counting Card featuring illustrations of six Starfishes.

Spanish Starfish Counting Card 6

Spanish Counting Card featuring illustrations of six Starfishes.

Spanish Counting Card featuring illustrations of seven Starfishes.

Spanish Starfish Counting Card 7

Spanish Counting Card featuring illustrations of seven Starfishes.

Spanish Counting Card featuring illustrations of eight Starfishes.

Spanish Starfish Counting Card 8

Spanish Counting Card featuring illustrations of eight Starfishes.

Spanish Counting Card featuring illustrations of nine Starfishes.

Spanish Starfish Counting Card 9

Spanish Counting Card featuring illustrations of nine Starfishes.

Spanish Counting Card featuring illustrations of ten Starfishes.

Spanish Starfish Counting Card 10

Spanish Counting Card featuring illustrations of ten Starfishes.

Illustration that shows if two parallel lines are cut by three or more transversals that pass through the same point, the corresponding segments are proportional.

Parallel Lines Cut by Transversals

Illustration that shows if two parallel lines are cut by three or more transversals that pass through…

Illustration that shows if two parallel lines are cut by three or more transversals that pass through the same point, the corresponding segments are proportional.

Parallel Lines Cut by Transversals

Illustration that shows if two parallel lines are cut by three or more transversals that pass through…