### Home > MC1 > Chapter 9 > Lesson 9.3.1 > Problem 9-124

9-124.

Recall the diagram from the Math Notes boxfrom Lesson 9.3.1 below.

Also recall that the same Math Notes box says that the circumference = 2*π*(radius).

2*π*(3inches) = 6*π* ≈ 18.84 inches

Refer to the diagram from part (a) and recall that the circumference = *π*(diameter).

27*π*

To get an approximate decimal answer, round *π* so that it equals 3.14.