Question

The radil of two circles are 13cm and 6cm respectively. The radius of the circle which has circumference equal to sum of the circumference of the two circles is

Answer 1

Circumference of circle =2pi r
r1=13 r2=6
C2=2*22/7*6=264/7
C1=2*22/7*13=572/7
C1+C2=C
C=264/7+572/7
C=836/7
C=2pi r
836/7=2 *22/7* r
r=826/7*7/22*1/2
r=18.7
Hope it helped you