A chord of length 30cm is 8cm away from the center of the circle. What is the radius of the circle. What is the perimeter of the sector? Take (pi =frac{22}{7})
-
A.
16cm -
B.
17cm -
C.
18cm -
D.
20cm
Correct Answer: Option B
Explanation
From the diagram
(r^2 = B^2 + 15^2\
= 64 + 225\
r = sqrt{289} = 17cm)