The outer circumference of circular racing track is 60 m longer than the
inner circumference.
Assume that the cross-section of an old oak tree is circular in shape and its
circumference is 5.2 m.Find the area of the cross-section.
The cross-secton of a building is made up of two sectors and shown in the
figure,where angle AOB=27 ℃,angle DOA=90 ℃and OD= 10 m.If C is the main point of OB, find the area of the cross-section.
Area and Volume
2008-05-18 8:42 pm
回答 (1)
2008-05-18 9:21 pm
✔ 最佳答案
1)Lack of information, can't help2) radius of the oak tree
= 5.2 / 3.14 / 2
= 0.83 (m)
area of cross section
= 0.83^2 x 3.14
= 2.16 (m^2)
3) no graphic shown, also can't help.
收錄日期: 2021-04-25 13:36:21
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https://hk.answers.yahoo.com/question/index?qid=20080518000051KK01110