Question

The radius, diameter, or circumference of a circle is given. Find the missing measures. Round to the nearest hundredth if necessary.

d = 19.4 cm, r = 2, C = 2
A. r = 38.8 cm, C = 30.47 cm
B. r = 9.7 cm, C = 60.95 cm
C. r = 9.7 cm, C = 30.47 cm
D. r = 38.8 cm, C = 60.95 cm

Answer 1

C. r= 9.7 cm, C= 30.47 cm

Answer 2

B

r=9.7

C=60.95

Explanation:

Given diameter of 19.4

r = d/2

19.4/2

r=9.7

C= 2(pi)r

2(pi)(9.7)

60.95 = C