If one star equals four circles and three circles equal four diamonds, then what is the ratio of star to diamond? `1:3` b. `3:4` c. `3: 16` d. `16 :3`

If A diamond B=4A-B , what is the value of (3diamond2)diamond3 ?

The circumferences of two circles are in the ratio 3: 4. The ratio of their areas is (a) 3:4 (b) 4:3 (c)9:16 (d) 16 :9

16^(-3/4) is equal to

The circumferences of two circles are in the ratio 3:4. The ratio of their areas is 3:4 (b) 4:39:16(d)16:9

The radii of two circles are in the ratio 2:3. The ratio of their areas is (a) 2:3 (b) 4:9 (c) 3:2 (d) 9:4

The radii of two circles are in the ratio 2: 3. The ratio of their areas is (a) 2:3 (b) 4:9 (c) 3:2 (d) 9:4

From a circular sheet of paper with radius 20 cm, four circles of radius 5 cm each are cut out. What is the ratio of the uncut to the cut portion? (a) 1 : 3 (b) 3 : 1 (c) 4 : 1 (d) 4 : 3

If the four equal circles of radius 3 cm touch each other externally, then the area of the region bounded by the four circles is