中一數學(十分!!)

2007-06-12 4:38 am
http://hk.geocities.com/fr_fr_chopin/figure.JPG

What is the total surface area of this figure?
What is the definition of "surface area"? Please answer me in Chinese.

I will give the person 10 marks if he/she answers the most detail.
更新1:

Actually, I want to know that do we also need to calculate the grey area?

更新2:

Sorry, I think that there are some people answer quite well. I can't decide which one is the best one. Therefore, I give a chance to people to vote for you all!

回答 (4)

2007-06-12 5:09 am
✔ 最佳答案
Total surface area.
(4x4-1x1)x2+4x4x4
=30+84
=134cm2
surface area系叫做表面面積,就以依個圖形為例:
列式中的4x4-1x1就是圖形裹"回"形的部份,圖形有2面"回"形,所以x2(不過其中1面我們看不到)
列式中的4x4就是其中1面"口"形的部份(在圖形的最頂),圖形有4面"口"形,所以x4(不過其中2面我們看不到)
2面"回"形+4面"口"形=(4x4-1x1)x2+4x4x4=134cm2
*圖形灰色那部分不用計,因為它不是表面,是在裡面.

2007-06-11 21:11:42 補充:
sorry,4x4x4=64so the answer is 94cm2
參考: me
2007-06-12 9:07 am
(4*4*4)+(1*1*4)+{(4*4)-(1*1)}*2
=64+4+30
=98cm^2

2007-06-12 15:59:56 補充:
(4*4*4) (1*4*4) {(4*4)-(1*1)}*2=64 16 30=110cm^2 this is the correct one.
參考: me
2007-06-12 6:16 am
the total surface area
=總表面面積
=一個立體的所有面的面積
= [(4x4)-(1x1)]x2+(4x4)x4
=(16-1)x2+16x4
=94 cm^2

surface area 即是表面面積
表面面積是一個立體的其中一個面的面積
即是圖中的(4x4)cm^2或是(4x4-1x1)cm^2
它們都是其中一個面的面積
參考: 自己
2007-06-12 4:41 am
surface area:

4(4)-1(1) = 16-1 = 15cm^2

表面面積的定義是一個立體的其中一面的面積。


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