1.The figure on the right is composed of square ABCD and triangle BCE,where ∠BEC is right angle．Suppose the length of CE is a,and the length of BE is b,then the distance between point A and line CE equals to ．
(be composed of 由…组成 right angle 直角 length 长度 distance 距离)
2.在△ABC中,AB＞BC,BD平分∠ABC,若BD将△ABC的周长分为4∶3的两部分,则△ABD与△BCD的面积比等于
Sorry啊,我不会放图,应该可以想象出来吧.
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第一题，△BCE在正方形的外部。可以回答了吗