sabrinismail10
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Shape A and shape B are two similar solid shapes.The ratio of the volume of shape A to the volume of shape B is 1: 10 The surface area of shape B is 72 cm 􏰀Work out the surface area of shape A.Give your answer correct to 3 significant figures.
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old_engineer
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(Original post by sabrinismail10)
Shape A and shape B are two similar solid shapes.The ratio of the volume of shape A to the volume of shape B is 1: 10 The surface area of shape B is 72 cm 􏰀Work out the surface area of shape A.Give your answer correct to 3 significant figures.
If two similar 3D shapes have linear dimensions in the ratio 1:r, then their surface areas will be in the ratio 1:r^2 and their volumes will be in the ratio 1:r^3. See if you can use that to make progress. Post your working if stuck.
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