Find the measure of the unknown angle.154.9°52.4°?75.8°

The sum of the angles in a quadrilateral (a shape with four sides) is 360 degrees.

To find the unknown angle, you can subtract the sum of the known angles from 360.

Step 1: Add the known angles together. 154.9° + 52.4° + 75.8° = 283.1°

Step 2: Subtract the sum of the known angles from 360°. 360° - 283.1° = 76.9°

So, the measure of the unknown angle is 76.9°.