Perimeter of triangle, rectangle, square

2. PERIMETER
•The distance around the polygon /the
distance around the outside of the polygon
•To find the perimeter of a polygon, take the
sum of the length of each side.
•The distance around geometric figure

3. Find the perimeter of a polygon

5. Example 1: Find the perimeter of a triangle with sides
measuring 5 centimeters, 9 centimeters and
11 centimeters.
Example 1: Find the perimeter of
a triangle with sides
measuring 5 centimeters, 9
centimeters and 11
centimeters.
• It contains three
types of triangles
equilateral, isosceles
and scalene.

6. • Find the perimeter of an equilateral triangle with each side
measuring 4 centimeters.
• Formula: length(3)

7. Examples:
1. Find the perimeter of a triangle with sides
measuring 10 inches, 14 inches and 15 inches

8. Example 1: Find the perimeter of
a square with each side
measuring 2 inches

9. EXAMPLES:
1. The perimeter of a square is 20 feet. How long is
each side?
2. The side of the square is 4m. What is the perimeter
of the square.

10. Example 2: A rectangle has a length of 8
centimeters and a width of 3
centimeters. Find the
perimeter.

12. • A rectangle has a length of 12 centimeters and a
width of 4 centimeters. Find the perimeter

15. Example 5: Find the perimeter of
a regular
pentagon with each
side measuring 3
inches

16. Example 6: The perimeter of
a regular hexagon is 18
centimeters. How long is
one side?

17. • The perimeter of a regular pentagon is 100
centimeters. How long is each side?