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IB MAI HL Geometry & Trigonometry Topic 3.1 Geometry of 3D Shapes (id: 78569289e

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admin 发表于 2024-2-5 14:14:24 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.1 Geometry of 3D Shapes,类别为 IB数学

[填空题]
A plastic toy is in the shape of a right pyr 4 ,.fcxf8+ikhors7 ezvo+kj. d.garm)gx1b g(vk48* k;nxufamid. The pyramid has a square base with the sides 4 cm long. The diagram below represents this pyramid, labelled VABCD. V is the vertex of the pyramid. O is the center of the base ABCD. M is the )1mk(v*xg..vr +g b4k8jan xfkgu;odmidpoint of BC. The angle $\mathrm{V}\hat{\mathrm{B}}\mathrm{C}$ is equal to$75^{circ}C$.


1.Calculate the length of VM.  cm
2.Calculate the height of the pyramid, VO.  cm
3.Find the volume of the pyramid, in $cm^3$. Give your answer correct to one decimal place.  $cm^3$
4.Write down your answer to part (c) in the form $a \times 10^k$, where $1 \leq a \leq 10$ and $k \in \mathbb Z$.  $\times10^1\:cm^3$

Another plastic toy is in the shape of a right cone. The height of the cone is equal to the height of the pyramid, and the diameter of the cone's base is equal to 4 cm.

5.Determine whether the amount of plastic used to manufacture the pyramid is also enough to manufacture this cone.  $cm^3$

After heating, the pyramid deforms in such a way that the angle $\mathrm{V}\hat{\mathrm{B}}\mathrm{C}$ decreases by 20%. The side VC decreases in length during this deformation, however sides VB and BC stay the same length.

6.Calculate
1.The new distance from the pyramid vertex V to point M.  cm
2.The new area of the pyramid's side VBC.  $cm^2$




参考答案:
空格1: 7.46±3%空格2: 7.19±3%空格3: 38.3±3%空格4: 3.83±3%空格5: 30.1±3%空格6: 6.95±3%空格7: 13.4±3%


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