Mathematics
Junior High
至急お願いします！！！この問題の解き方教えてください！
9 右の図のABCD は AD-12.cm, AB=10cm です。
∠Aの二等分線が辺BCと交わる点を E, ∠D の二等分
線が辺BCと交わる点をFとするとき, 線分EF の長さを
求めなさい｡
10
ト
A
BF
E C
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