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# What is a compound shape in math?

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In math, a compound shape consists of two or more simple shapes, such as triangles, squares, circles and rectangles. Another name for a compound shape is a composite shape. An example of this concept is a triangle placed on top of a square.

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In geometry, composite shapes are commonly used in problems that deal with finding areas. Solving these types of problems involves taking the separate areas of each shape and then adding them to find the total area of the given composite figure. For example, to find the area of a shape that contains a triangle and rectangle, the length and width of the rectangle and the base and height of the triangle must be known. The formula to find the total area of this composite figure is the area of the triangle plus the area of the rectangle, which is 1/2(b x h)+ ( l x w).

## Related Questions

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A tetrahedron is a four-faced polyhedron, or three-dimensional shape, created with triangles. The triangles in a tetrahedron are usually equilateral. To make a tetrahedron, you need paper, scissors, glue and an instrument, such as a protractor, to measure the sides and angles.

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Three triangles can be drawn inside a regular pentagon. If the diagonals are drawn from any one vertex of the pentagon, the number of triangles formed is given by the formula n - 2, where “n” is the number of sides of the polygon.

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Pyramids are three-dimensional tetrahedrons with a base, which can be rectangular or triangular, and corresponding sides comprised of triangles that meet at a single apex. Thus, because there are multiple kinds of pyramids, there are multiple pyramid-shaped or pyramid-like objects in and around the household.