Question

A quadrilateral has three acute angle each measures 80. find 4th angle

Answer 1

Let the fourth angle be a

By angle sum property of quadrilateral,

a + 80 + 80 + 80= 360

=> a + 240 = 360

=> a = 120

Fourth angle = 120°

Answer 2

Sum of all angles at vertices in an quadrilateral is 360°


Here, three angles are given,


80 + 80 + 80 + fourth angle = 360

=> 240 + fourth angle = 360

=> fourth angle = 120°