4 − [7 + {6 7 9 ÷ 1 3 ( 1 2 + 4 9 )} − 2] .
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Exterior angle property
The sum of interior and the corresponding exterior angles at each vertex of any polygon are supplementary to each other. For a polygon;
Interior angle + Exterior angle = 180 degrees
Exterior angle = 180 degrees – Interior angle
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