Question

three angles of a quadrilateral are 54 degree and 80 degree and 116 degree find the measure of fourth angle

Answer 1

sum of all angles in quadrilateral=360
$54 + 80 + 116 + x = 360 \\ 250 + x = 360 \\ x = 360 - 250 \\ x = 110$
fourth angle is 110°

Answer 2

In quadraterial
Angle 1 = 54
Angle 2=80
Angle 3=116
Angle 4=?
Let angle 4=d
Than
Angle1+Angle2+Angle3+Angle4=360
54+80+116+d=360
250+d=360
d=360-250
d=110
Therefore Angle4=110