 ### Composite Figure of Quadrilateral Frustum With Half of a Cylinder Attached

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

An illustration of a circular cone. ### Right Circular Cone

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

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

Labeled shapes showing various measures of form. ### Altitude and Diagonal of a Parallelogram

Illustration of a parallelogram with altitude and diagonal drawn. ### Area of a Parallelogram

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

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area. ### Parallelogram With Dimensions

Parallelogram with dimensions labeled. Parallelogram can be used to calculate area. ### Parallelogram and Rectangle Relationship

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

Diagram used to prove the theorem: "The volume of a any parallelopiped is equal to the product of its… ### Pentagon With Triangular Sections For Area

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

Diagram used to prove the theorem: "The volume of a prismatoid is equal to the product of one-sixth… ### Pyramid Frustum With Hexagonal Bases and 6 inch and 10 inch Sides

An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part… ### Pyramid Frustum With Triangular Bases and Height of 27 inches

An illustration of a pyramid with the top cut off by a plane parallel to the base. The remaining part… ### Pyramid Frustum With Triangular Bases and Height of 27 inches

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

An illustration of a pyramid with a hexagonal base. ### Pentagonal Pyramid For Volume

Illustration of pentagonal pyramid used to show that the volume is equal to one third of the product… ### Regular Pyramid With Square Base

An illustration of a regular pyramid with a square base and labels on lateral edge, slant height, altitude,… ### Pyramid With Triangular Base

An illustration of a pyramid with a triangular base. ### Triangular Pyramid For Volume

Illustration of triangular pyramid used to show that the volume is equal to one third of the product… ### Right Triangle Inscribed In A Semicircle

An illustration of a right triangle inscribed in a semicircle. ### Trapezoid

Trapezoid with angles and height labeled. ### Area of a Trapezoid

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

Trapezoid with dimensions labeled. Trapezoid can be used to calculate area. ### Triangle With Height and Median

Triangle with height/altitude h and median m. ### Acute Triangle

An illustration of an acute triangle with the height/altitude labeled h. ### Triangle With Altitude and Isosceles Triangles Within

Illustration showing a triangle with an altitude CD passing through the middle of EF. Triangles AEC… ### Altitudes Drawn from Base Angles of Isosceles Triangles

Illustration to show altitudes drawn from base angles of an isosceles triangle. ### Altitudes In A Triangle

Illustration used to show "The altitudes of a triangle are concurrent." ### Area of Triangle

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

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

Triangle with dimensions labeled. Triangle can be used to calculate area. ### Triangle With Dimensions

Triangle with dimensions labeled. Triangle can be used to calculate area. ### Equilateral Triangle

Sketch of equilateral triangle with bisectors, medians, and altitudes. ### Obtuse Triangle

Obtuse triangle with altitude drawn. ### Obtuse Triangle

Obtuse triangle with altitude and one median drawn. ### Obtuse Triangle With Height Drawn

Triangle with sides a,b,c and height/altitude h. ### Obtuse Triangle

An illustration of an obtuse triangle with the height/altitude labeled h. ### Orthocenter of Triangle

Illustration to show altitudes in a triangle. It is known as the orthocenter. ### Parts Of A Triangle

Illustration used to show the various parts of a triangle: sides, angles, medians, altitudes, bisectors,… ### Perpendiculars Dropped Any Point in the Equilateral Triangle

Illustration to show the perpendiculars dropped from any point in the equilateral triangle to the three… ### 3 Isosceles Triangles Wit Equal Bases

Illustration of three isosceles triangles with the same base AC but varying heights (as B gets farther… ### Similar Triangles With Altitudes Drawn

Illustration that shows two similar triangles with altitudes drawn. ### Volume of Triangular Prism

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

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

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