the radius of a spherical balloon increases from 7 cm to 14 cm as air is being pumped into it find the ratio of surface area of the Ballon in the two cases
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Answer:
ratio = 1:4
Step-by-step explanation:
SA= 4πr²
case 1:
r=7cm
SA= 4πr²= (4X 22 x 7 x7)/7
SA=4x22x7
case 2:
r=14cm
SA=(4 x22 x14 x 14)/7
SA= 4 x22x 2x 14
ratio
=(4x22x7)/(4x22x2x14)
ratio= 1:4
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