The sector of a circle has radius of 21 cm and central angle 270o. Find its perimeter?	Choose the correct answer.
A) 91.5 B) 92 C) 93 D) 141 E) 95
Perimeter of the sector = length of the arc + 2(radius)   = (270/360 * 2 * 22/7 * 21) + 2(21)   = 141 cm   Answer: Option 141
<result>D</result>
The sector of a circle has radius of 21 cm and central angle 270o. Find its perimeter?