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The length of radius of spherical gas balloon incrcases from 7 cm to 21 cm as air is beingpumped into it let us find the ratio of surface arcas of the balloon in two cases |
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Answer» R = radius of ballon = 7cmr = radius of pumped ballon = 21cm surface area of sphere before inflated / urface area of spherical ballon after inflated =4×(22/7)×R×R / 4 × (22/7) × r×r = R×R/r×r=7×7/21×21= 1:9 hit like if you find it useful |
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