Question

The measures of the three angles of a quadrilateral are 65°, 75° and 85°. The measure of the fourth angle is
(a) 65°
(b) 75°
(c) 85°
(d) 135°.​

Answer 1

Answer:

135 ° is right answer

Answer 2

Sum of the angles in a quadrilateral is 360°

Let the 4th angle be 'x'

So, 65°+75°+85°+X = 360°

225+X= 360

X= 360-225 = 135°

your answer is [D] 135°

Hope uh understand..