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平行移動
DESCRIPTION
平行移動. 平面上で、図形を一定の方向に 、一定の 長さ だけずらして 、図形を移すこと. 対称移動. ℓ. 平面上で、図形を 一つの直線 ℓ を折り目 として、折り返してその図形を移すこと. 回転移動. 平面上で、図形 を１つの点 O を中心として、 一定の角度だけ 回して、その図形を移すこと. O. ９０度回転.
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平行移動
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