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Published byJuliet Miller Modified over 8 years ago

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Perimeter Rectangles, Squares, and Triangles

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Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure, ADD the lengths of its sides.

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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

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To find the perimeter of a rectangle: 18 15 Use the formula P= 2 x length + 2 x width P= 2 x 18 + 2 x 15 P= 36 + 30= 66 Or ……. You can always add the sides. P= 18 + 18 +15 +15= 66

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What is a square? A square has: 4 equal sides 4 right angles

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To find the perimeter of a square: Use the formula: P = 4 x side P = 4 x 3 = 12 3 3 Or.... You can add the sides. P = 3 + 3 + 3 + 3 = 12

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What is a triangle? A triangle has 3 sides. All triangles may not look the same, but they all have 3 sides.

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To find the perimeter of a triangle: Use the formula: P = side + side + side P = 6 + 6 + 4 = 16 66 4

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Circumference of a Circle The perimeter, or the distance around a circle, is called the circumference.

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Circumference of a Circle To find the circumference of a circle, you need to know either the diameter or radius of the circle.

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The diameter of a circle is a line segment drawn through the center of the circle with endpoints on the circle. Diameter

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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

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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.

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Find the circumference of the circle. C = pi x diameter C = 3.14 x 4= 12.56 4

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