Question

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

Answer 1

sum of all the angles of a quadrilateral is 360°.
fourth angle = 360-(54+80+116)
=360-250
=110°

Answer 2

We have,

angles of the quadrilateral = 54 ° , 80° , 116°

Let required angle = x °

since, sum of all angels of the quadrilateral = 360 °
means,

x ° +54 + 80 + 116 = 360

=> x ° = 360 - ( 54 +80 + 116)

=> x ° = 360 - 250

=> x ° = 110 °