Question

question no. 10 is my dought please help me

Answer 1

Given figure contains 1 big semi-circle and 2 small semi-circles

$\text{\underline{\underline{Perimeter of Big semi-circle}}}$

Radius = 10 cm

Perimeter = πr = π ( 10 ) = 10π cm

$\text{\underline{\underline{Perimeter of 2 Small semi-circles}}}$

Radius = $\dfrac{10}{2}$ = 5 cm

Perimeter = 2 ( πr ) = 2 ( π × 5 ) = 10π cm

$\text{\underline{\underline{Total Perimeter}}}$

= 10π + 10π

= $<b>20π cm</b>$