1.

If the perimeter of a semi-circle is 144 cm, then find its radius (in cm).1). 562). 293). 284). 58

Answer»

Perimeter of semi-circle = R(π + 2)

⇒ 144 = r(22/7 + 2)

⇒ 144 = 36/7 × r

⇒ r = 4 × 7 = 28 cm


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