# Perimeter - PowerPoint PPT Presentation

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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

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 . . . .

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.

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

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