A) 9 cm |
B) 12 cm |
C) 15 cm |
D) 18 cm |
A) 9 cm |
Given : radius of circle A = 3 cm, thus diameter of A = 6 cm
Also, radius of circle B = radius of circle C = 6 cm.
If r is the radius of circle D, then
\( \Large \pi 3^{2}+ \pi .6^{2}+ \pi .6^{2}= \pi r^{2} \)
=> \( \Large r^{2} = 81 \)
=> \( \Large r\ =\ 9\,cm. \)