alternate angles
A small battery having the form of a squat cylinder.
(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.
Full of applause or praise.
(idiomatic) to leave somewhere angrily
横切る直線が2本の平行線を交差すると、その直線の反対側にできる内角（錯角）は等しく、それを利用して三角形の合同を証明できます。
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DiQt
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