1. The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratio of the surface areas of the balloons in two cases is

a. 1:4

b. 1:3

c. 2:3

d. l:2

Mathematics - Surface Areas and Volumes

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140 questions in 14 tests. Each test contains 10 questions.