Question

如圖，路燈（點(diǎn)）距地面8米，身高1.6米的小明從距路燈的底部（點(diǎn)）20米的A點(diǎn)，沿OA所在的直線行走14米到B點(diǎn)時(shí)，身影的長度是變長了還是變短了？變長或變短了多少米？
 

Answer 1

小明的身影變短了3.5米．解析:

，，
．·································································· （2分）
，即．
解得．············································································· （4分）
同理，可求得·········································· （7分）
所以，小明的身影變短了3.5米．