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

Given the angles are 57°, 138°, and 83°, you can find the unknown angle by subtracting the sum of the given angles from 360°.

Step 1: Add the given angles together.
57° + 138° + 83° = 278°

Step 2: Subtract the sum of the given angles from 360° to find the unknown angle.
360° - 278° = 82°

So, the measure of the unknown angle is 82°.

Question

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

Given the angles are 57°, 138°, and 83°, you can find the unknown angle by subtracting the sum of the given angles from 360°.

Step 1: Add the given angles together.
57° + 138° + 83° = 278°

Step 2: Subtract the sum of the given angles from 360° to find the unknown angle.
360° - 278° = 82°

So, the measure of the unknown angle is 82°.

Knowee AI · Accepted Answer

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

Given the angles are 57°, 138°, and 83°, you can find the unknown angle by subtracting the sum of the given angles from 360°.

Step 1: Add the given angles together.
57° + 138° + 83° = 278°

Step 2: Subtract the sum of the given angles from 360° to find the unknown angle.
360° - 278° = 82°

So, the measure of the unknown angle is 82°.

Find the measure of the unknown angle.57°138°?83°