### Angle

Illustration of an angle

### Plane Angle of Incidence

A diagram illustrating the airplane's angle of incidence at axis A, direction of motion and thrust.

### Plane Pointing Down Angle of Incidence

The diagram illustrating the plane's angle of incidence pointing down at the motion axis. The plan will…

### Angle of Vision

"The angle under which the rays of light, coming from the extremities of an object, cross each other…

### Acute Angle

An illustration showing an angle the is less than a right angle. This is an acute angle.

### Bisected Angle

Illustration to show that if an angle is bisected, and if a line drawn through the vertex perpendicular…

### Bisected Angles

Illustration to show that the bisectors of two supplementary adjacent angles are perpendicular to each…

### Bisected Angle

Illustration to show that the bisector of one of two vertical angles bisects the other.

### Bisected Angles

Illustration to show that the bisector of two pairs of vertical angles formed by two intersecting lines…

### Bisected Vertical Angle of an Isosceles Triangle

Illustration to show that the bisector of the vertical angle of an isosceles triangle bisects the base,…

### Angle Bisector Drawn Parallel to A Side

Illustration to show that if through any point in the bisector of an angle a line is drawn parallel…

### Construction of Angle

Illustration of construction to lay off an angle.

### Construction Of A Divided Angle

An illustration showing the construction used to divide an angle into two equal parts. "With C as a…

### Construction Of A Divided Angle

An illustration showing the construction used to divide an angle into two equal parts when the lines…

### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point in its bisector…

### Perpendiculars To The Sides Of An Angle

Illustration used to show "The two perpendiculars to the sides of an angle from any point not in its…

### Straight Angle

An illustration showing a straight angle. When the sides of an angle extend in opposite directions,…

### Trihedral Angle

Trihedral angle. "The sum of any two face angles of a trihedral angle is greater than the third face…

### Acute and Reflex Angles

Illustration showing two positive angles; angle 1 being the acute angle and angle 2 being the reflex…

### Acute, Obtuse, Straight, Right, And Reflex Angles

An illustration showing acute, obtuse, straight, right, and reflex angles.

An illustration of two angles that are adjacent. They have the same vertex and a common side between…

Angles 1 and 2 are adjacent angles. Two angles with a common vertex and a common side between them are…

### Complementary Angles

Complementary angles

### Complementary Angles

Illustration of complementary angles. Two angles whose sum is a right angle.

### Equal Right Angles

Illustration used to prove that all right angles are equal.

### Evolute Spiral Angles

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

### Evolute Spiral Angles

The evolute spiral angle is a wave pattern that mimics the wave of the sea.

### Obtuse And Reflex Angles

An illustration showing an angle the is greater than a right angle and less than a straight angle. This…

### Angles With Parallel Sides

Illustration of angles with parallel corresponding sides.

### Angles With Parallel Sides

Illustration of angles with parallel sides going in the opposite direction.

### Angles With Parallel Sides

Illustration of angles with parallel sides. "GH is parallel to and lies in the same direction as DE,…

### Relationships Between 4 Angles

Illustration showing four angles that can be used to define different relationships, such as adjacent,…

### Relationships Between 4 Angles

Illustration showing four angles that can be used to define different relationships, such as adjacent,…

### Relationships Between 6 Angles

Illustration showing six angles that can be used to define different relationships, such as adjacent,…

### Sum of 2 Acute Angles

Illustration of two triangles, showing the sine of the sum of two acute angles expressed in terms of…

### Superposition of Angles

Illustration of the superposition of two angles to compare magnitudes of the same kind.

### Supplementary Angles

Supplementary angles

### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle.

### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow…

### Supplementary Angles

Illustration of supplementary angles. Two angles whose sum is a straight angle. This can be used tow…

### Supplementary Angles

Illustration that can be used to show supplementary angles. The angles form a straight line.

### Supplementary Angles

Illustration of supplementary angles. Angles LMK and KMH are supplementary.

### Supplementary and Right Angles

Illustration showing angles 1 and 2 are supplementary and angles ACD and DCB are supplementary. Also,…

### Vertical Angles

Vertical angles are when two angles have the same vertex, and the sides of the one are prolongations…

### Angles With Parallel Sides

Illustration of two angles whose sides are parallel, each to each, to show they are either equal or…

### Anglo-Saxon Ships with Wind in the Sails

A fleet of three ancient Anglo-Saxon ships, each with wind filling the lone sail. Each ship has a dragon…

### Positive and Negative Arcs in Circles

Illustration showing arcs measured in positive and negative angles.

### Bevel Square

Bevel, is a and tool consisting of two rules that are hinged together so you can draw or measure angles…

### Angle Bisector

Illustration showing that the bisector of a given angle is the locus of points equidistant from the…

### Perpendicular Bisector of a Line

Illustration showing that the perpendicular bisector of a given line is the locus of points equidistant…

### Ambiguous Case

Illustration of one possible outcome (no triangle occurs) when discussing the ambiguous case using the…

### Ambiguous Case

Illustration of one possible outcome (1 triangle occurs) when discussing the ambiguous case using the…

### Ambiguous Case

Illustration of one possible outcome (2 triangles occur) when discussing the ambiguous case using the…

### Circle With 36 degree Angles and Radius 1.5 in.

Circle with 36 degree angles marked. This diagram can be used with the following trig problem: Locate…

### Circle With Center o and Radius r with point P

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

### Circle With Chord and Tangent

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

### Circle With a Chord of 2 ft. and a Radius of 3 ft.

Circle with chord AB=2 ft. and radius OA = 3 ft.. Triangle AOC is a right triangle. Angle AOC=half angle…

### Circle with Segment, Semicircle, Sector, Quadrant, and Central Angle

Illustrations of a circle with segment, semicircle, sector, quadrant, and central angles drawn.

### Circle With Two Intersecting Chords

Illustration of a circle with two intersecting chords within the circumference. The angle formed is…

### 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…