Question

Find the perimeter of semicircle having radius 21cm

Answer 1

$\huge{\blue{\underline{\underline{Answer-}}}}$

Perimeter of semicircle is 66 cm.

$\huge{\blue{\underline{\underline{Explanation-}}}}$

Radius of circle = 21 cm

Perimeter of circle = 2πr

= 2 ×22/7 × 21

= 132 cm

perimeter of semicircle = 132 / 2

= 66 cm

hope it helps...... ✨