perimeter rectangles, squares, and triangles perimeter measures the distance around the edge of any...
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![Page 1: Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,](https://reader036.vdocuments.us/reader036/viewer/2022082610/56649da35503460f94a9016f/html5/thumbnails/1.jpg)
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 widthP= 2 x 18 + 2 x 15P= 36 + 30= 66
Or …….You can always add the sides.P= 18 + 18 +15 +15= 66
![Page 5: Perimeter Rectangles, Squares, and Triangles Perimeter Measures the distance around the edge of any flat object. To find the perimeter of any figure,](https://reader036.vdocuments.us/reader036/viewer/2022082610/56649da35503460f94a9016f/html5/thumbnails/5.jpg)
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
6 6
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
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