Question

The exterior angles of a triangle is 153° and its opposite interior angles are in the ratio 4:5. Find the measure of opposite interior angles.

Answer 1

4x+5x=153
9x=153
x=153/9
x=17
this is answer
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Answer 2

4x+5x=153 (sum of opp interior angles is the length of the exterior angle)
9x=153
x=153÷9
x=17
4x=4×17=68
5x=5×17=85