Question

Find the perimeter of a semicircular plate of radius 3.85cm​

Answer 1

perimeter of semi circular plate = 1/2×2πr

perimeter= 22/7×3.85

perimeter= 12.1

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Answer 2

Given

Radius of Semicircular plate = 3.85 cm

We Find

Perimeter of given Semicircular

We Know

$\boxed{\red{Perimeter\:of\:Semicircular\:=\:πr \: + \:2r }}$

According to the question

Perimeter of Semicircular = πr + 2r

Perimeter of Semicircular = 22/7 × 3.85 + 2 × 3.85

Perimeter of Semicircular = 84.7/7 + 7.7

Perimeter of Semicircular = 12.1 + 7.7

Perimeter of Semicircular = 19.8

Hence, perimeter of semicircular plate is 19.8 CM.