Sum of the angles in a triangle

Animation outlining the proof that the sum of the angles in a triangle is 180°. A line is drawn through the top vertex of the triangle which is parallel to the base and then the alternate angles are shown.
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GreenMaths —

 
教材タイプ
ワークシート
タグ
angle 
対象者層（年齢）
11 – 14
言語
English (United Kingdom)
 
 

GeoGebraブック

 
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