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

An illustration of a right circular cone with labels on slant height and altitude.

Illustration of a cone with a polygon inscribed used to show that the volume of a circular cone is equal…

Illustration of a parallelogram with altitude and diagonal drawn.

Illustration of parallelogram AEFC drawn two different ways with base b and altitude/height a used to…

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area.

Parallelogram with dimensions drawn to show relationship to the area of a rectangle.

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

Pentagon with dimensions labeled. Pentagon can be used to calculate area by calculating individual triangles…

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

An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part…

An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part…

An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part…

Illustration of pentagonal pyramid used to show that the volume is equal to one third of the product…

An illustration of a regular pyramid with a square base and labels on lateral edge, slant height, altitude,…

Illustration of triangular pyramid used to show that the volume is equal to one third of the product…

An illustration of a right triangle inscribed in a semicircle.

Illustration of a trapezoid with altitude a and bases b and b' used to demonstrate that the area is…

Trapezoid with dimensions labeled. Trapezoid can be used to calculate area.

Illustration showing a triangle with an altitude CD passing through the middle of EF. Triangles AEC…

Illustration to show altitudes drawn from base angles of an isosceles triangle.

Parallelogram illustration to show where the area of a triangle formula comes from.

Illustration of triangle ABC with altitude a and base b to be used to demonstrate that the area is 1/2ba.

Illustration to show altitudes in a triangle. It is known as the orthocenter.

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 three isosceles triangles with the same base AC but varying heights (as B gets farther…

Illustration that shows two similar triangles with altitudes drawn.

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

Diagram used to prove the theorem: "The volume of a triangular pyramid is equal to one third of a triangular…

Diagram used to prove the theorem: "Two triangular pyramids having equivalent bases and equal altitudes…