Question

Find the measure of the 4th angle of
quadrilateral,
if the measures of .
three
angles of
quadrilateral are 65 degree, 75 degree and 85 degree
​

Answer 1

Answer:

The answer is 135°

Step-by-step explanation:

The sum of angles of a quadrilateral is 360°.

So, <1+<2+<3+<4=360°

65+75+85+ <4=360

360-225= 135°

Hence, the 4th angle is 135°

Answer 2

Answer:

135°

Step-by-step explanation:

we know that sum of angles of quadrilateral is 360°.

So, let the 4th angle be X.

Now,

x+ 65° + 75°+ 85° = 360°

x + 225°= 360°

x = 360° -225°

x = 135°.