An irregular polygon with 4 sides is shown.Select the equation that can be used to find the side length, d, given the perimeter, P , and other three sides.Ad=P−a−b+cBd=P−a−b−cCd=P/a−b−cDd=P−a+b+c

The correct answer would be b) d=P-a-b-c

You would take the perimeter and subtract the 3 known sides from it to find the missing side.