Question

two adjacent angles of a quadrilateral are 90° each and the third angle is 140°. find the fourth angle​

Answer 1

Answer:

The fourth angle is 40°

Step-by-step explanation:

Let the fourth angle be x°

We know all angles of a quadrilateral sum up to 360°

Let the equation to find x be:

90 + 90 + 140 + x = 360

320 + x = 360

x = 360 - 320

x = 40°

Answer 2

Answer:

40°

Step-by-step explanation:

A quadrilateral sums up it's all angles in 360°

90° + 90° + 140° = 320°

360° - 320° = 40°

Hence the fourth angle is of measure 40°.