This mathematics ClipArt gallery offers 127 images that can be used to demonstrate various geometric theorems and proofs.

Diagram used to prove the theorem: "The opposite faces of a parallelopiped are equal and parallel."

Diagram used to prove the theorem: "The rectangular parallelopipeds which have two dimensions in common…

Diagram used to prove the theorem: "The rectangular parallelopipeds are to each other as the product…

Diagram used to prove the theorem: "The volume of a any parallelopiped is equal to the product of its…

Diagram used to prove the theorem: "The volume of a rectangular parallelopiped is equal to the product…

"If two intersecting planes are each perpendicular to a third plane, their intersection is also perpendicular…

"If a straight line is perpendicular to each of two straight lines at their point of intersection it…

"If one of two parallels is perpendicular to a plane, the other is also."

"Through a given line oblique to a plane, one, and only one plane, can be passed perpendicular to the…

Diagram used to prove the theorem: "If a pyramid is cut by a plane parallel to the base, the edges are…

Diagram used to prove the theorem: "Every section of a sphere by a lane is a circle."

Diagram used to prove the theorem: "A plane perpendicular to a radius at its extremity is tangent to…

Illustration of three intersecting planes. "The intersections of two parallel planes by a third plane…

Illustration of three intersecting planes. "The straight line perpendicular to one of two parallel lanes…

"If two straight lines are cut by three parallel planes, the corresponding segments are proportional."

"If two angles not in the same plane have their sides respectively parallel and lying in the same direction,…

"If two intersecting lines are each parallel to a given plane, the plane of these lines is parallel…

"If two planes are perpendicular to each other, a line in one of them perpendicular to the intersection…

Diagram used to prove the theorem: "Two similar polyhedrons may be decomposed into the same number of…

Diagram used to prove the theorem: "The lateral area of a prism is equal to the product of a lateral…

Diagram used to prove the theorem: "The volume of a prismatoid is equal to the product of one-sixth…

Diagram used to prove the theorem: "Two prisms are equal when the three faces about a trihedral of one…

Illustration used to prove "Two angles whose sides are perpendicular each to each are either equal or…

Illustration used to prove the Pythagorean Theorem, according to Euclid. A perpendicular is drawn from…

Illustration used to prove "An exterior angle of a triangle is equal to the sum of the two remote interior…

Illustration that can be used to prove the Pythagorean Theorem, the sum of the squares of the legs is…

Illustration that can be used to prove the Pythagorean Theorem, the sum of the squares of the legs is…

A visual illustration used to prove the Pythagorean Theorem by rearrangement. When the 4 identical triangles…

Illustration used to prove "If the sides of any polygon are prolonged in succession one way, no two…

Illustration used to prove "The sum of all the angles of any polygon is twice as many right angles as…

An illustration showing a model that illustrates the Pythagorean Theorem: a² + b² = c².

An illustration showing that the area of a regular polygon is equal to the area of a triangle whose…

Illustration used to show "If one acute angle of a right triangle is double the other, the hypotenuse…

Five points are given, of which not three are in a line, a curve of second order may be drawn through…

Illustration of a circle used to prove "Any angle inscribed in a semicircle is a right angle."

Illustration used to prove "The line bisecting one side of a triangle and parallel to another side bisects…

Diagram used to prove the theorem: "All points in the circumference of a circle of a sphere are equally…

Diagram used to prove the theorem: "A spherical angle is measured by the arc of a great circle described…

Diagram used to prove the theorem: "The volume of a spherical segment is equal to the sum of two cylinders…

Diagram used to prove the theorem: "The area of a spherical triangle, expressed in spherical degrees,…

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

Diagram used to prove the theorem: "Between two straight lines not in the same plane only one perpendicular…

Diagram used to prove the theorem: "The area of the surface generated by a straight line revolving about…

Diagram used to prove the theorem: "Two tetrahedrons having a trihedral angle in each equal, are to…

Illustration used to prove the theorem, "Two angles whose sides are parallel, each to each, are either…

Illustration used to prove the theorem, "Two angles whose sides are perpendicular, each to each, are…

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 one side of a triangle is prolonged, the exterior angle formed is…

Illustration used to prove that "If two straight lines are parallel to a third straight line, they are…

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."

Illustration used to prove the theorem, "The sum of the angles of any triangle is two right angles."

Illustration used to prove the theorem, "If two straight lines are cut by a transversal making a pair…

Illustration used to prove the theorem, "If two parallel lines are cut by a transversal, the alternate…

Illustration used to prove the theorem "The line bisecting one of the non parallel sides of a trapezoid…

Illustration used to prove "The bisectors of the angles of a triangle are concurrent in a point which…

Illustration used to show "Any two medians of a triangle intersect each other in a trisection point…