Question

Find the radius of a circle whose area is equal to the sum of the area of three circle whose radii are 3cm,4cm and 12cm.

Answer 1

so the radius is equal to 13 units

Answer 2

Answer: Let radius of circle to found be x

so, area of circle is πx²

area of circle with radius x= sum of areas of circle of radius 3cm, 4cm, 12cm

πx²= π3²+π4²+π12²

x²=π(3²+4²+12²)/π

x²= 3²+4²+12²                                            (π is cancled)

x²=9+16+144

x²=169

x=√169

x=13 cm

Hope satisfied with my answer