標題:
F4 Maths 3-D problems ( -.- )
發問:
Fig. I shows a triangular sheet of paper ABC which is cut along the diagonal of a square sheet of paper of side 10 cm. O is the mid - point BC.a) Find OB, OC and OA in surd form.b) In figure II, the triangular sheet of paper is folded up along along OA such that AB and AC lie on a horizontal plane.... 顯示更多 Fig. I shows a triangular sheet of paper ABC which is cut along the diagonal of a square sheet of paper of side 10 cm. O is the mid - point BC. a) Find OB, OC and OA in surd form. b) In figure II, the triangular sheet of paper is folded up along along OA such that AB and AC lie on a horizontal plane. Suppose angle BAC = 40 degree and P is the projection of O on the horizontal plane. i) Find BC. ii) Find angle BOC. iii) FInd the volume of OABC. (HInt: Volume of pyramid = 1/3 x base area x height) iv) Hence, find OP. Figure: http://img532.imageshack.us/img532/5947/43mathso.jpg 更新: biii) 49.9 cm^3 iv) 4.66 cm
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As follows: 圖片參考：http://i.imagehost.org/0959/ScreenHunter_01_Mar_24_22_26.gif 2010-03-27 16:42:59 補充： 更改 http://j.imagehost.org/0841/ScreenHunter_06_Mar_27_16_40.gif
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