why is sum of all angles in a triangle 180 degrees?
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In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the angle in the bottom right corner to make a 1800 angle. The inevitable conclusion of this game is that the interior angles of a triangle must always add up to 1800.
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because all the sides r equal and to find the answer we need using the sum of all angles in a triangle
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