题目

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？   答案：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． 

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