Question

If three angles of a quadrilateral are each equal to 75 the fourth angle is

Answer 1

$sum \: of \: interior \:angles \: o \: a \: quadrilateral = 360 \\ \\ = > 75 + 75 + 75 + x = 360 \\ = > 225 + x = 360 \\ = > x = 360 - 225 \\ = > x = 135 \\ \\ \\ therefore \: the \: fourth \: ange \: is \: of \: 135 \: degree.$