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CIA2
作者：
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GeoGebra
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Reflection = 180° Rotation about a Line
Reflection Across 2 Parallel Lines
z`]]
seo tool
Reflection across a line
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Quiz: Special Right Triangles
Tangent on curve
Pythagorean Theorem and Distance Formula
alternate interior angles 03
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代數
幾何分布
直線
3D 向量（三維）
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