Using dilation to show the sum of the angles in a triangle

Autor:Duane Habecker

We all know that a half-circle has 180°. Watch the angles of this triangle move together to form a half circle. This is a demonstration that the sum of the angles in a triangle is 180°.

Nous materials

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Perpendicular Lines: Quick Exploration
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milya
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Descobriu Temes

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Paral·lelogram
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Aritmètica