Question

The area of a semi-circle is 308cm2. Calculate
i) the radius of the circle.

ii) the perimeter of the semi-circle.
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Answer 1

Answer:

Pie is denoted by #

i) Area of semi circle = #(r^2)/2

308 = 22 × r^2

7 × 2

r = 7cm

ii) Perimeter = #r + d (where d=2r)

= 22/7 × 7 + 2×7

= 22 + 14

= 36cm