1 GWD 几何题...

scorpio2rd

In the figure, each side of square ABCD has length 1, the length of line segment CE is 1, and the length of line segment BE is equal to the length of line segment DE.  What is the area of the triangular region BCE?

 

A.     1/3

B.     (Ö2)/4

C.     1/2

D.     (Ö2)/2

E.      3/4

Answer B

Please see attachment for the picture.

多谢多谢......

[attachimg]67894[/attachimg]

bongrim

BE=DE   所以CE 是AC 的延长线.      设BD 与AC 的交点是O, 则BO是三角形BCE 的垂直线.且,长度=根号2/ 2   CE=1  面积=根号2/   2     *1  /2=(Ö2)/4

lakeDZ

多谢2楼，我以为这个图是3维的呢，半天没做出来。。。