配套习题- 相似三角形的应用 -【青果学苑】

1/5单选题

难度：

1.如图，数学兴趣小组的小颖想测量教学楼前的一棵树的树高，下午课外活动时她测得一根长为1m的竹竿的影长是0.8m，但当她马上测量树高时，发现树的影子不全落在地面上，有一部分影子落在教学楼的墙壁上（如图），他先测得留在墙壁上的影高为1.2m，又测得地面的影长为2.6m，请你帮她算一下，树高是（　　）

A	3.25m
B	4.25m
C	4.45m
D	4.75m

正确答案：Qw==

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

2/5单选题

难度：

2.如图，为测量学校旗杆的高度，小东用长为3.2m的竹竿作测量工具，移动竹竿，使竹竿顶端与旗杆顶端的影子恰好落在地面的同一点，此时，竹竿与这一点相距8m，与旗杆相距22m，则旗杆的高为（　　）m．

A	8.8
B	10
C	12
D	14

正确答案：Qw==

6Kej77ya5Zug5Li656u556u/5ZKM5peX5p2G5Z2H5Z6C55u05LqO5Zyw6Z2i77yM5omA5Lul5p6E5oiQ5Lik5Liq55u45Ly85LiJ6KeS5b2i77yMPGJyPuiLpeiuvuaXl+adhumrmHjnsbPvvIw8YnI+5YiZPGltZyB3aWR0aD0xNSBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9DNy9BNy9yQkFDRTFXYmxRX3dYTHcwQUFBQmdYS1JKamsyMzUucG5nIj7vvJ08aW1nIHdpZHRoPTI2IGhlaWdodD00MiBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzkxL0NEL3JCQUNKMVdibFFfQW1JVmlBQUFCWmZfRktzUTU2My5wbmciPu+8jDxicj7iiLR4PTEy77yOPGJyPuaVhemAiUPvvI4=

3/5单选题

难度：

3.如图，测得BD=120m，DC=60m，EC=50m，则河宽AB为（　　）

A	120m
B	100m
C	75m
D	25m

正确答案：Qg==

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

4/5单选题

难度：

4.一个钢筋三角架三边长分别为20cm，50cm，60cm，现在要做一个和它相似的钢筋三角架，而只有长为30cm和50cm的两根钢筋，要求以其中的一根为一边，从另一根上截两段（允许有余料）作为另两边，则不同的截法有（　　）

A	一种
B	两种
C	三种
D	四种或四种以上

正确答案：Qg==

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

5/5单选题

难度：

5.如图，小明在打网球时，使球恰好能打过网，而且落在离网4米的位置上，则球拍击球的高度h为（　　）

A	1.6米
B	1.5米
C	2.4米
D	1.2米

正确答案：Qg==

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