Circumference of a circle is 132 cm. What is the perimeter of its sector whose central angle is 135°?
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Answer:
circumference of the circle=
2 πr=132, r =132x7/22x2=21cm
length of the arc=
Xx2πr/360=135x2x22 x 21/360x7
= 49.5cm
Perimeter of the circle=
arc length +2 radius
= 49.5+21x2 = 49.5+42=91.5cm
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