Question

triangle ABC is an equilateral triangle with side 21 centimetres and find the perimeter of the given figure​

Answer 1

the perimeter of the given figure is 63cm.

Answer 2

Perimeter of given figure will be :
(Perimeter of semicicle × 3 ) - perimeter of triangle
$(\pi \times 11.5 \times 3) - 63$
Therefore answer will be 36 cm