Page 672 - Basic College Mathematics with Early Integers

S E C T I O N 9.3 I PERIMETER 649

65. a. Find the circumference of each circle. 66. a. Find the circumference of each circle.
Approximate the circumference by using Approximate the circumference by using
3.14 for p. 3.14 for p.

10 m 20 m 16 m 32 m

b. If the radius of a circle is doubled, is its b. If the diameter of a circle is doubled, is its
corresponding circumference doubled? corresponding circumference doubled?

67. In your own words, explain how to find the 68. In your own words, explain how perimeter and
perimeter of any polygon. circumference are the same and how they are
different.

Find the perimeter. Round your results to the nearest tenth.

69. 70.
6 meters

6 meters
6 meters

6 meters

71. 72. 5 feet

5 m
7 feet
22 m

73. The perimeter of this rectangle is 31 feet. Find its 74. The perimeter of this square is 18 inches. Find the
width. length of a side.
9 ft

?