4 angles will form if two lines intersect and the sum of those 4 angles is 360°
we are given the sum of 3 angles i.e 270
so one of the angles should be
simplify substraction:
therefore since one of the angles is 90° the intercepting lines are <u>Perpendicular</u><u> </u>as a result every single angle formed by the two intercepting lines is <u>9</u><u>0</u><u>°</u>