Proof: Sum of angles in a triangle is 180 degrees

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Line ED is parallel to line AB. Triangle ABC is outlined in blue. Observe how the shape and angles of this triangle ABC change as we move the points A, B and C.

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vases communiquants.
Transversal Angles
Distance Formula Interactive
Bài tập 6a trang 126

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不等邊三角形
極限值
複數
表面
統計特徵

Proof: Sum of angles in a triangle is 180 degrees

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