Interior angles in a triangle add up to 180 ... And if angles 𝑥, 𝑦 and 𝑐 equal 180, our second rule. Then angles 𝑎, 𝑏 and 𝑐 must equal 180 as well. This proves that the ...
The sum of interior angles in a triangle is 180°. To prove \(a + b + c = 180^\circ\), firstly draw a line parallel to one side of the triangle. \(d = b\) (alternate angles are equal ...
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