Question

the radius of the circle is 14 cm find the radius of the circle, whose area is double of the area of the circle

Answer 1

Area of the Smaller Circle = Л(14)²
                                          = Л*196
So radius of larger circle = 2*Л*196
                                       =  Л*392

Let radius of bigger circle be R
                ЛR² = Л*392
           so, R² = 392
       Radius of Bigger circle = 14√2 cm

Answer 2

Area of the given circle=(22/7)*14*14

Area of another circle=2{(22/7)*14*14}
=2*44*14
=1232 cm sqa.

Radius(r)
(22/7)*r*r=1232
r*r=1232*7/22
=56*7
=392
r=√392
=19cm(approx)