更新1:
要有式 肯定答案約=20912.39 cm^2
****急!F.2 數 英文的 圓的surface area
2009-05-07 2:51 am
A rubbish bin is made of iron. It has two part as shownA rubbish bin is made of iron. It has two part as shown.The lower part is a cuboid without a cover.It is 60 cm long,50cm wide and 60cm high.The upper part is half of a cyliner.Find the total area of iron plate required to make the rubbish bin.
回答 (2)
2009-05-07 7:04 am
✔ 最佳答案
The radius of the cyliner is 25 and the height is 60.So the total area of iron plate required to make the rubbish bin
=50*60*3+60*60*2+pi*25*60
=20912.39 cm^2
2009-05-07 4:44 am
22875.88439?
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https://hk.answers.yahoo.com/question/index?qid=20090506000051KK01190