Question

Find the perimeter of the following shapes to 1 decimal place(2π=3.14)

Answer 1

According to the figure, it seems a semicircle
whose perimeter is πr or π(d/2)
$\pi \times ( \frac{diameter}{2} ) \\ = 3.14 \times \frac{6}{2} cm \\ = 9.42cm$

Answer 2

perimeter of the circle=3.14 ×d
perimeter of semi circle=1/2 × 3.14 × 6
=9.4cm.sq

hope it will helps you...