Question

Find the perimeter of semi circular plate of radius 3.85 cm .

Answer 1

perimeter of semi circle = pi×r+ 2r


=22/7×3.85 + 2 ×3.85

=12.1+7.7

19.8

Answer 2

perimeter = 2 pier
per = 2 × 22/7×3.85
ans = 19.8