Question

if the diameter of the protector is 14cm, then find its perimeter

Answer 1

Perimeter of semicircle = pi*r + 2r

Since d= 14cm

=r = d/2 = 14/2cm
= 7cm.

P= 22/7 × 7cm + 2*7cm

= 22cm + 14cm

= 36cm.

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Answer 2

protector have shape of a half circle
radius = 14/2= 7cm
perimeter of half of a circle =πr + diameter
= 22/7×7 + 2×7
=( 22 +14 )cm²
= 36 cm²