Question

Three angles of a quadrilateral are 75°,90° and 60°. Find the fourth angle.

please tell me the answer it's urgent ​

Answer 1

Answer:

135°

Step-by-step explanation:

Let the measure of the fourth angle be x°.

Then, the sum of the angles of a quadrilateral is 360°.

Thus,

75° + 90° + 60° + x = 360°

=> 225° + x = 360°

=> x = 360° - 225° = 135°

Hence, the measure of the fourth angle is 135°.