Question

The area of a semicircular field is 77 cm. Find its perimeter.
The perimeter of a semicircle is 72 cm. Find its area

please help me
tomorrow has my exams​

Answer 1

Answer: perimeter = 252 cm; area = 308 sq cm

Step-by-step explanation:

Area of a semicircle = πr²/2 where r=radius of the semicircle

=> πr² = 77*2 = 154

=> r² = 154 * (7/22) = 49 cm

Perimeter of a semicircle = 2r +(2πr/2) = 2r + π4 = r*(2+π)

=> perimeter = 49 * (2 +22/7) = 49 * (36/7) = 36 * 7 = 252 cm

Given

Perimeter of the semicircle = r(2+π) = 72

=> r * (36/7) = 72

=> r = 72 * (7/36)

=> r = 14 cm

Area of a semicircle = πr²/2

=> area = (22/7) * 14 * 14 * (1/2) = 22 * 14

=> area = 308 sq cm

Please brainlist my answer, if helpful!

Answer 2

first ans = 36 cm

second ans = 308