Question

the diameter of two circle a and b are 16 and 30 cm .find the radius of circle whose area is equal to differance of area of a and b.

Answer 1

1.26 cm raidus of new circle

Answer 2

ar of circle a=180×r×r

=180×64
ar of circle b=180×r×r
=180×225
difference=180×161
area=180×r×r
=r×r=161
r=
$\sqrt{161}$