Final answer:
To find the fourth angle of a quadrilateral, subtract the sum of the other three angles from 360 degrees. For angles measuring 80, 120, and 65 degrees, the fourth angle is 95 degrees.
Step-by-step explanation:
The measurement of the fourth angle of a quadrilateral can be determined by knowing that the sum of the interior angles of any quadrilateral is 360 degrees. Given three angles measuring 80 degrees, 120 degrees, and 65 degrees, you can find the fourth angle by subtracting the sum of the given angles from 360 degrees.
Step 1: Sum the given angles: 80 + 120 + 65 = 265 degrees.
Step 2: Subtract the sum from 360 degrees: 360 - 265 = 95 degrees.
Therefore, the measurement of the fourth angle is 95 degrees.