\(a + d + e = 180^\circ\) (angles on a straight line add up to 180°) So \(a + b + c = 180^\circ\). These facts can be used to calculate angles.
Interior angles in a triangle add up to 180Ëš. Triangles close triangleA polygon with three straight sides. have three sides, therefore they have three angles. Interior angles in a triangle sum to ...
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