The radii of two concentric circles are 3cm and 2cm. the ratio of their areas.
A. 3 : 4
B. 9 : 2
C. 9 : 4
D. 4 : 3
Answer:C
The radii of two concentric circles are 3cm and 2cm. the ratio of their areas.
A. 3 : 4 B. 9 : 2 C. 9 : 4 D. 4 : 3