Question

Find the circumferences of the two circles. Circle A has a radius of 21 meters and Circle B has a radius of 28 meters. Use pencil and paper. Is the relationship between the radius of a circle and the distance around the circle the same for all​ circles? Explain. The circumference of Circle A is nothing meters.

Answer 1

• Circumference of Circle A=131.95m
• Circumference of Circle B=175.93m

Explanation:

Given two circles A and B

• Circumference of a circle =
  `2 \pi r`

• Radius of Circle A=21 meters

Circumference of Circle A
`=2*21*\pi=42\pi=131.95m` meters

• Radius of Circle B=28 meters

Circumference of Circle B
`=2*28*\pi=56\pi=175.93m` meters

The larger the radius of a circle, the larger the circumference. We notice that the radius of circle B is larger so its circumference is also larger.