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[發問問題] 2000 LQ #18 PART B

18題 b(i) 題目話find the suface area of the container(excluding the base) ,即唔計底部,但ans條式點解唔洗減返底部?

本帖最後由 ihatemaths 於 2015-10-28 13:51 編輯


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The surface area of a sphere = 4 x pi x r^2

so, surface area of half of a sphere = 2 x pi x r^2
and this does not include the base area

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