Question

The area of a semi circular protactor is 19.25cm find the radius of protactor

Answer 1

Answer: r = √12.25 = 3.5 cm

Step-by-step explanation:

area of semi circle = πr²/2

we know that area = 19.25

so

πr²/2 = 19.25

=>πr² = 38.5

=>22/7 r² = 38.5

=>r² = 38.5 * 7/22 = 12.25

=> r = √12.25 = 3.5 cm