Question

34. The radius of a circle is 7cm. Find the perimeter of
its semi-circle-
(a) 40cm
(b) 14cm
(c) 20cm
(d) 36cm​

Answer 1

2πr=semi perimeter

2×22÷7×7=44 is the ans

Answer 2

$\huge{\mathcal{\blue{Answer}}}$

First:

The perimeter of the circle:

$= 2\pi \: r \\ = 2 \times \frac{22}{7} \times (7cm) \\ = 44cm$

The perimeter of the semicircle is the half of the perimeter of its circumference

$\large{=44cm/2}$

$\huge{\mathcal{\green{\boxed{22cm}}}}$