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三角形ABP=三角形ADP+三角形ABDなので
三角形ABP=AD×高さ①÷2+AD×高さ②÷2
     =AD×(高さ①+高さ②)÷2

‪( ´▿` )‬

わかりやすかったです!
ありがとうございます🙇‍♂️🙏

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