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Triangle Names and Angle Sum (Interior and Exterior)
作者:
Morton Betts
主題:
正三角形
,
等腰三角形
,
直角三角形
,
不等邊三角形
,
三角形
How to name triangles. The conditions for naming triangles. Proof the sum of interior (inside) angles = 180 deg. Proof the other two angles equal exterior angle.
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