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## Perimeter

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**Perimeter**Rectangles, Squares, and Triangles**Perimeter**• Measures the distance around the edge of any flat object. • To find the perimeter of any figure, ADD the lengths of its sides.**What is a rectangle?**• A rectangle has: • 4 sides • 4 square corners or right angles • Opposite sides are of equal lengths • Opposite sides are directly across from each other**To find the perimeter of a rectangle:**18 Use the formula P= 2 x length + 2 x width P= 2 x 18 + 2 x 15 P= 36 + 30= 66 15 Or ……. You can always add the sides. P= 18 + 18 +15 +15= 66**What is a square?**A square has: • 4 equal sides • 4 right angles**To find the perimeter of a square:**3 Use the formula: • P = 4 x side • P = 4 x 3 = 12 3 Or . . . . You can add the sides. P = 3 + 3 + 3 + 3 = 12**What is a triangle?**• A triangle has 3 sides. All triangles may not look the same, but they all have 3 sides.**To find the perimeter of a triangle:**Use the formula: • P = side + side + side • P = 6 + 6 + 4 = 16 6 6 4**Circumference of a Circle**• The perimeter, or the distance around a circle, is called the circumference.**Circumference of a Circle**• To find the circumference of a circle, you need to know either the diameter or radius of the circle.**The diameter of a circle is a line segment drawn through the**center of the circle with endpoints on the circle. Diameter**The radius is a line segment connecting the circle’s**center to a point on the circle. The length of the radius is one-half the length of the diameter. Radius Diameter**The formula for finding circumference (C) is C = pi x**diameter. • The value of pi is about 3.14, so the formula for finding the circumference of a circle is C = 3.14 x diameter.**Find the circumference of the circle.**• C = pi x diameter • C = 3.14 x 4= 12.56 4