An isosceles triangle has 2 sides of equal length ... To prove \(a + b + c = 180^\circ\), firstly draw a line parallel to one side of the triangle. \(d = b\) (alternate angles are equal ...
An isosceles triangle has 2 sides of equal length ... 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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