1.

A sector of radius 4.2 cm has an area 9.24 cm2. Find its perimeter.

Answer»

Radius of the sector r = 4.2 cm

Area of the sector = 9.24 cm2

lr/2 = 9.24

(l×4.2)/2 = 9.24

l × 2.1 = 9.24

l = 9.24/2.1

l = 4.4 cm

Perimeter of the sector = 1 + 2r units 

= 4.4 + 2(4.2) cm

= 4.4 + 8.4 cm 

= 12. 8 cm

Perimeter of the sector = 12.8 cm



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