✨ Best Answer ✨
DFに線を引く
△ADEを３Sとすると
△DBFは２S
△EFC=２S☓２／３＝４S／３
△ABC=３S+４S+４S／３＝２５S／３
△DBFE=４S=３６
S=９を代入し、７５ かな？
Answers
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✨ Best Answer ✨
DFに線を引く
△ADEを３Sとすると
△DBFは２S
△EFC=２S☓２／３＝４S／３
△ABC=３S+４S+４S／３＝２５S／３
△DBFE=４S=３６
S=９を代入し、７５ かな？
Users viewing this question
are also looking at these questions 😉
ありがとうございました！