Last Updated：2025/11/20

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(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

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alternate angles

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Source Word

alternate angles

Noun

plural plural-only

(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

Japanese Meaning

平行線と交わる第三の直線が作る、互いに反対側に位置する内角（交互内角）

What is this buttons?

When a transversal crosses two parallel lines, the alternate angles formed on opposite sides of the transversal are equal, so you can use them to prove triangles are congruent.

Google Translation / DeepL Translation

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。

Details

Sense（1）

(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

Sense（2）

If the parallels AB, CD, are cut by the line EF, intersecting at points G and H, then the angles AGH, GHD, are called alternate angles (as also are the angles BGH and GHC).

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alternate angles

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alternate angles

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