The measure of a triangle’s outside angle is equal to the sum of the measures of its opposite interior angles. Angle d = Angle a + Angle c ∠d = ∠a + ∠c
Exterior angle theorem
Geometry
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Geometry
The measure of a triangle’s outside angle is equal to the sum of the measures of its opposite interior angles. Angle d = Angle a + Angle c ∠d = ∠a + ∠c