Question

three angles of a quadrilateral are 120⚙ ,80⚙,60⚙ respectively . find the measure of the fourth angle

Answer 1

120+80+60+x=360
260+x=360
x=100

Answer 2

120+80+60+x = 360 because the Sum of all angles of quadrilateral is 360
260 + x = 360
x = 360-260= 100
hope it helps u