△AFDの面積を2とすると
△FBD＝3
△ABD＝△AFD＋△FBD＝5
△ABD＝△CDB＝5
平行四辺形ABCD＝△ABD＋△CDB＝10
よって3：10
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△AFDの面積を2とすると
△FBD＝3
△ABD＝△AFD＋△FBD＝5
△ABD＝△CDB＝5
平行四辺形ABCD＝△ABD＋△CDB＝10
よって3：10
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are also looking at these questions 😉
