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

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Perimeter

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Perimeter

Perimeter

Rectangles, Squares, and Triangles


Perimeter1

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

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

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

What is a square?

A square has:

  • 4 equal sides

  • 4 right angles


To find the perimeter of a square

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

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

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

Circumference of a Circle

  • The perimeter, or the distance around a circle, is called the circumference.


Circumference of a circle1

Circumference of a Circle

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


Perimeter

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

Diameter


Perimeter

  • 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 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

Find the circumference of the circle.

  • C = pi x diameter

  • C = 3.14 x 4= 12.56

4


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