Exterior Angle Theorem: Definition, Proof, Examples, Facts, FAQs
https://www.splashlearn.com/math-vocabulary/exterior-angle-theorem
WEBAccording to the exterior angle theorem, ∠ B C D = ∠ A + ∠ B. We can use this theorem to find the measure of an unknown angle in a triangle. Example: Find x. Here, x is the exterior angle with two opposite interior angles measuring 55 ∘ and 45 ∘. By the exterior angle theorem, x = 55 ∘ + 45 ∘ = 100 ∘.
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