2024·全国·模拟预测
名校
解题方法
1 . 如图,在三棱锥
中,点
为棱
的中点,点
为
的中点,
,
,
都是正三角形.
平面
;
(2)若三棱锥
的体积为
,求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b506b0941433a6a5d5387d0ec95596ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93394d8a463f5ee5cbbbcb77a6771e09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ce03b310edce42191f9fa75a1c909ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0874f019492261eb175bdcc08c189d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8ee3afb7e2c8943673449a1b136faf0.png)
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名校
解题方法
2 . 如图,在正三棱锥P-ABC中,
,
.
![](https://img.xkw.com/dksih/QBM/2022/10/19/3091099104493568/3094738914500608/STEM/43365d51f94b4a079ee2157375721d33.png?resizew=166)
(1)求此三棱锥的侧面积;
(2)若M是侧面PBC上一点,试在平面PBC上过点M画一条与棱PA垂直的直线,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cae3a349f2de58d032d09c90bd256e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93edbd735d79524f463085a4e9093bd.png)
![](https://img.xkw.com/dksih/QBM/2022/10/19/3091099104493568/3094738914500608/STEM/43365d51f94b4a079ee2157375721d33.png?resizew=166)
(1)求此三棱锥的侧面积;
(2)若M是侧面PBC上一点,试在平面PBC上过点M画一条与棱PA垂直的直线,并说明理由.
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名校
解题方法
3 . 如图,在四棱锥
中,底面ABCD为正方形,PA⊥平面ABCD,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/319827f0-304c-4e90-aa57-86b7bd4cc206.png?resizew=176)
(1)证明:BD⏊平面PAC;
(2)求三棱锥
的表面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be2b61f4a38e2ee2c1a01e00b3ae6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79323d3e31f7cd551fc725afca2b68b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf650025692f85934a8fadfe2a1a720.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/26/319827f0-304c-4e90-aa57-86b7bd4cc206.png?resizew=176)
(1)证明:BD⏊平面PAC;
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc493fff08143e682919de32bab873d.png)
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