The perimeter of a semi circle is 144 cm then the radius is?

One Answer on this Question

1. Perimeter of semi circular = πr+2r

   Where r is radius , π = 22/7

   πr+2r= 144 (given)

   (22/7)r +2r = 144

   22r+14r = 144*7 (multiply both sides by 7)

   36r = 144*7

   r= 144*7/36 = 28

   radius =28 cm

   Area =( 1/2)πr^2

   Area=( 1/2 )*(22/7)*28*28

   = 1232cm^2
   Ans : area is 1232 cm^2

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