Question

rea & Circumference of a Circle

Question 1
The formula for the circumference of a circle is C = 2πr.

What is the circumference of the circle shown? (in terms of π)
Responses
A 2π ft2π ft
B 4π ft4π ft
C 6π ft6π ft
D 12π ft12π ft
Question 2
The formula for the area of a circle is A = π
.

What is the area of the circle shown? (in terms of π)
Responses
A 3π
3π ft 2
B 6π
6π ft 2
C 9π
9π ft 2
D 18π
18π ft 2
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Answer 1

Question 1: C = 2πr. If r = 3 ft, C = 2π(3) = 6π ft → choice C.

Question 2: A = πr^2. If r = 3 ft, A = π(3^2) = 9π ft^2 → choice C.