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How to find x in a triangle with an exterior angle?

User Falstaff
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-say in the situation "C" was "X"; angle ∠C and ∠D are supplementary angles so ∠D-180=∠C
-all triangle, angles sums =180° so ∠A+∠B+∠C=180
-if the triangle were to be a right triangle you could use 30,60,90 or 45,45,90 but you need to know the measure of one of 2 of the angles
How to find x in a triangle with an exterior angle?-example-1
User Emiel Zuurbier
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