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  3. The flat triangular lot depicted above is available for development. If 150 meters, what is the area of the lot in square meter

The flat triangular lot depicted above is available for development. If 150 meters, what is the area of the lot in square meter

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问题 The flat triangular lot depicted above is available for development. If 150 meters, what is the area of the lot in square meters?
选项 A、 
B、 
C、 
D、 
E、 
答案D
解析 You can tell from the statement that x=100 meters, and since one of the legs of the right triangle is x/2 and the hypotenuse is x, you can tell that this is a 30-60-90 triangle, and the legs of the triangle are then 50 and . The area of a triangle is one-half base times height, so .
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