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MATHS~!1題
2007-06-16 3:34 am
回答 (3)
2007-06-17 2:40 am
✔ 最佳答案
vice_ultraman錯晒因為嗰條根本唔係heightheight=√3.5^2-(5/2)^2
=√6
volume=3x4x√6/3
=4√6cm^3
2)base area of the conical paper cup=2^2pi
height=30x3/4pi
=22.5/pi
3)3sin^2Θ+4cos^2Θ=4
3(sin^2Θ+cos^2Θ)+cos^2Θ=4 (sin^2Θ+cos^2Θ=1)
cos^2Θ=1
Θ=0
cosΘ=1
2007-06-16 3:45 am
DB=√3^2+4^2
DO(O=center)=above ans/2
√3.5^2-DO^2=Height of pyramid
(Base area*Height)/3=(3*4)*Height of pyramid/3
=Volume of pyramid
DO(O=center)=above ans/2
√3.5^2-DO^2=Height of pyramid
(Base area*Height)/3=(3*4)*Height of pyramid/3
=Volume of pyramid
參考: myself
收錄日期: 2021-04-13 00:51:18
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070615000051KK03676