if the angles are adjacent, then the sum must be 180 degrees
W + X = 180 degrees
we know that the angle measure of is three time W
X = 3W
replace in a equation X with 3W
W + 3W = 180
4W = 180 / simplify with 4
W = 45 degrees
X = 3 multiply W = 135 degrees
X=135°
