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

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

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

An illustration of a composite figure made up of a quadrilateral frustum and half of a cylinder. Frustum…

Illustration used to show how to draw an equilateral triangle when given one side.

Illustration used to show how to draw an equilateral triangle when given the altitude.

An illustration of both sides of a U.S. Half Dollar that can be cutout and folded.

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration that shows similar polygons (pentagons) that can be used to show proportionality.

Illustration to show that an angle bisector of a triangle divides the opposite side into segments which…

Illustration to show that a bisector of a an exterior angle of a triangle divides the opposite side…

Illustration to show that if a line divides two sides of a triangle proportionally, it is parallel to…

An illustration of a rectangle with lengths a and b and area ab.

An illustration of composite rectangle with lengths a, b, and c with area ac + bc. This illustration…

A rectangular prism with labeled sides: AAAA are the four vertical parallel corners. BBBB and CCCC are…

Diagram used to prove the theorem: "In a spherical triangle, the greater side is opposite the greater…

An illustration of a hollow square (square within square) with outer square having a side of 2s+6 and…

Two set squares, whose sides are 3,4, and 5 in., are placed so that their 4-in. sides and right angles…

Illustration used to prove that "If two triangles have two sides of one equal respectively to two sides…

Illustration used to prove that "If two triangles have two sides of one equal respectively to two sides…

Illustration used to prove that "If two sides of a triangle are unequal, the angle opposite the greater…

Illustration used to prove that "The sum of any two sides of a triangle is greater than the third side."

Triangle with sides labeled with numerals 28, 36, 40 and angles A, B, C labeled.

Illustration to show that if one of the legs of an isosceles triangle is produced through the vertex…

Illustration to show that if the lines joining the middle points of the sides of a triangle divide the…

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,…

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

Illustration of a right triangle with legs labeled 150 and 85. This could be used to find the hypotenuse…

Illustration showing a triangle with an exterior segment drawn to show and exterior angle. This can…

Illustration of triangle ABC with BE extended through the triangle at point D. Segment AB is equal to…

Illustration to show if two triangles have two sides of the one equal, respectively, to two sides of…