Question

lf the area of a semi-circle region is 77cm2. find the perimeter.​

Answer 1

Answer:

Given:

Area of semicircle = 77cm2.

Area of semicircle = πr2/2

r2 = 49

r = 7cm.

Circumference of circle = 2πr.

Circumference of circle = 2 *22/7 *7

Circumference of circle = 44cm.

Note:

Circumference is known as perimeter of circle and it's formula is 2πr . where r is the radius of circle.

Thank you ✔️.

Answer 2

Answer:

area of semi circle region = 77cm^2

(πr^2)/2=77cm^2

πr^2=77×2cm^2

πr^2=154cm^2

we know that,

π=22/7

thus,

22/7×r^2=154

r^2=154×7/22

r^2=49cm2

r=√49cm2

r=7cm

now,

perimeter of semi circle = πr

=22/7×7

=22cm

that's all.