问题
单项选择题
The flat triangular lot depicted above is available for development. If 
150 meters, what is the area of the lot in square meters ？（）
A.A
B.B
C.C
D.D
E.E
答案
参考答案：D
解析：
You can tell from the statement 
that x=100 meters, and since one of the legs of the right triangle is 
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 
.