Question

Which is the length of HJ expressed in terms of pi?
A. 3/10 pi
B. 9/20 pi
C. 11/20 pi
D. 81/20 pi

Answer 1

Answer:

B. 9/20$\pi$

Step-by-step explanation:

the circumference is 2$\pi$r. Since the radius is one, that would be 2$\pi$.

81/360=0.225, or 22.5% of the circumference.  22.5% of 2$\pi$ is 0.45$\pi$.  0.45=9/20, so the answer is B.

CHECK: 2$\pi$ = 6.283

6.283x0.225=0.14137, or 9/20$\pi$