The sector of a circle has radius of 21 cm and central angle 90o. Find its perimeter?  Choose the correct choice:
A) 91.5
B) 75
C) 93
D) 94
E) 95
Perimeter of the sector = length of the arc + 2(radius)   = (90/360 * 2 * 22/7 * 21) + 2(21)   = 75 cm   Answer: Option 75
<result>B</result>
The sector of a circle has radius of 21 cm and central angle 90o. Find its perimeter?