Question

If the diameter of a semicircular protractor is 14cm then find its perimeter

Answer 1

Perimeter of semicircle = pi*r + 2r

Since d= 14cm

=r = d/2 = 14/2cm
= 7cm.

P= 22/7 × 7cm + 2*7cm

= 22cm + 14cm

= 36cm.

Hope it's helpful to u.

Answer 2

Radius=14/2=7cm
Then,
Perimeter of semicircle =pi×r+2×r
=22/7×7+2×7
=22+14
=36cm
Hope it helps u.