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(3)PI:IQ=5:4より
AQ:DG=4:(20/3)
AQ:QF=4:(8/3)=3:2

△AMQは平面AEFB上にあるので
□AEFB=8×10
△AEF=½×8×10

△AMQは△AEFの底辺が½, 高さが⅗なので
△AMQ=△AEF×½×⅗
=½×8×10×½×⅗

ひー

理解できました、ありがとうございます。

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