Question

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

Answer 1

3 is the correct answer.... bro

Let original radius be r.

Then, according to the question,

π(r+1)2−πr2=22

=> π×[(r+1)2−r2]=22

=> 227×(r+1+r)(r+1−r)=22

=> 2r+1=7 => 2r=6

r=3

Mark it as brain list

.

Answer 2

let original radius be r.

Then, according to the question,

π(r+1)2−πr2π(r+1)2−πr2=22

=> π×[(r+1)2−r2]π×[(r+1)2−r2]=22

=> 227×(r+1+r)(r+1−r)227×(r+1+r)(r+1−r)=22

=> 2r+1=7 => 2r=6

r=6262=3 cm