Question

(本小题17分) 如图,直角梯形纸片ABCD中,AD⊥AB,AB=4,AD=2,CD=3,点E,F分别在线段AB,AD上

Answer 1

过P作PG⊥AB于G,

DAGP是矩形,PG=DA=4,

PE=AE=5,

GE=√(PE^2-PG^2)=√(5^2-4^2)=3,

PD=AG=AE-GE=5-3=2

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