Question

the area of a circle is increased by 22cm² when its radius increased by 1cm. the original radius of circle is​

Answer 1

Step-by-step explanation:

Answer

Let the radius be 'r'

Radius increased by 1 cm so,

New radius be 'r+1'

So, as per question 

⇒π(r+1)2−πr2=22

⇒π[(r+1)2−r2]=22

⇒722[r2+2r+1−r2]=22

⇒2r+1=7

⇒2r=6

⇒r=3 cm

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