How do you find the perimeter of a semicircle that has a radius of 4 ft?

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Answer 1 · 2017-06-05T06:52:28

Perimeter of desired semicircle is #20.57# #ft.#

The perimeter of a semicircle includes

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half the circumference of circle i.e.

#(2pir)/2 =pir#, where #r# is radius.

and diameter on the other side i.e. #d =2r#

#P = pir + 2r#

Hence perimeter of a semicircle is #r(pi+2)#

As radius is #4# #ft.#

Perimeter of desired semicircle is #4xx(3.1416+2)#

#P=20.5664# or say #20.57# #ft.#