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# How to find the perimeter of shapes?

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To find the perimeter of any shape, the outside edges of the shape should be added together. The perimeter is defined as the distance that is around the outside of a two dimensional shape.

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There are certain formulas that can make finding the perimeter of different shapes easier and more efficient. To find the perimeter of a triangle, all three sides should be added together. To find the perimeter of a square, the length of one side can be multiplied by 4. To find the perimeter of a rectangle, the length and width can be added together and multiplied by 2. Since a quadrilateral does not have sides that are equal to each other, each of the sides should be added together individually.

The perimeter of a circle is called the circumference. The radius of a circle is half of a line through the middle of the circle. To find the circumference, the radius should be multiplied by pi and then multiplied by 2. A sector is a section of a circle that is defined by degrees in radians. To find the perimeter of a sector, the angle of the sector should be added to 2 and should be multiplied by the radius of the circle.

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## Related Questions

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A tetrahedron is a shape made out of four triangular faces, and it has a total of six edges. Although each of the four sides of a tetrahedron has three edges, the shape does not have 12 edges, as some of the edges are shared.This figure can also be referred to as a triangular pyramid.

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A tetrahedron is a three-dimensional shape that contains four vertices, four faces and six edges. This Platonic solid is classified as a polyhedron, specifically a regular convex polyhedron. This indicates that all the four faces of a tetrahedron are equal in shape and size, with the same number of surfaces joined at each vertex.

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Teach shapes to children by making a shape collage, drawing shapes on the sidewalk with chalk and sorting household items by shape. For a shape collage, cut paper into different shapes and sizes, and encourage the child to glue the smaller paper onto the larger piece of the same shape.