Question

the radius of circle a is 7 units. the radius of circle b is 3 times the radius of circle a.
what is the circumference of circle b?
leave your answer in terms of π.
□π units

Explanation:

Step1: Find radius of Circle B

Radius of A is 7, B is 3 more: \( 7 + 3 = 10 \)

Step2: Use circumference formula \( C = 2\pi r \)

Substitute \( r = 10 \): \( C = 2\pi \times 10 = 20\pi \)

Answer:

\( 20\pi \)