Question

find the perimeter of semi circular plate of radius 3.85cm

Answer 1

r=3.85cm
perimeter of the circle= 2πr
therefore the length of the curve of semi circle= 2πr/2=πr=12.095cm
perimeter of the semicircle = length of the curve of semicircle + diameter
=12.095+2(3.85)=12.095+7.7=19.795cm

Answer 2

Answer:

12.089 cm

Step-by-step explanation:

Perimeter of circle = $2\pi r$

Where r = radius

Perimeter of semicircle = $\frac{2\pi r }{2}$ = $\pi r$

We are given the radius of length 3.85 cm

Thus the perimeter of semi circular plate =  $3.14 \times 3.85$

                                                                    =  $12.089$

Hence the perimeter of semi circular plate is 12.089 cm