Mathematics
Junior High

△OABの面積を求める問題で式の(1+√5)−(1−√5)は高さだと思うけどなぜこの式で高さが求められるのか教えてください

Y=ax° YA B A 0 x
△OAB =2×{(1+ \5)-(1-V5)}×ー=2/5
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