Question

the area of a circle is increased by 22 sq cm when its radius is increased by 1 cm. Find the original radius of the circle

Answer 1

Answer:

3

Step-by-step explanation:

pi(r+1)²=pi(r)² + 22

pi(r²+2r+1)=pi(r²)+22

Pi(r²)+2Pi(r)+pi=pi(r²)+22

2r+1=22*7/22

r=(7-1)/2=3