题目内容
如图，路灯（
点）距地面8米，身高1.6米的小明从距路灯的底部（
点）20米的A点，沿OA所在的直线行走14米到B点时，身影的长度是变长了还是变短了？变长或变短了多少米？
小明的身影变短了3.5米．解析:
，
，
．·································································· （2分）
，即
．
解得
．············································································· （4分）
同理，
可求得
·········································· （7分）
所以，小明的身影变短了3.5米．
，，．·································································· （2分），即．解得
．············································································· （4分）同理，
可求得·········································· （7分）所以，小明的身影变短了3.5米．
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