The sector of a circle has radius of 21 cm and central angle 270o. Find its perimeter?
Choose the correct choice from the following answers
A) 145 cm
B) 135 cm
C) 121 cm
D) 141 cm
E) 151 cm
Perimeter of the sector = length of the arc + 2(radius)   = (270/360 * 2 * 22/7 * 21) + 2(21)   = 99 + 42= 
<gadget id="calculator">99 + 42</gadget>
<output>141</output>
141 cm   Answer: 141 cm
<result>D</result>
The sector of a circle has radius of 21 cm and central angle 270o. Find its perimeter?