The sector of a circle has radius of 21 cm and central angle 135o. Find its perimeter?	Choose the correct choice:
A) 91.5 cm B) 91.8 cm C) 99.5 cm D) 91.6 cm E) 91.3 cm
Perimeter of the sector   = length of the arc + 2(radius)   = (135/360 * 2 * 22/7 * 21) + 2(21)   = 49.5 + 42= 
<gadget id="calculator">49.5 + 42</gadget>
<output>91.5</output>
91.5 cm   91.5 cmnswer: 91.5 cm
<result>A</result>
The sector of a circle has radius of 21 cm and central angle 135o. Find its perimeter?