Answer:

The sum of four angles of a polygon having 4 sides is 360°.

The largest angle is 165°.

Solution:

x° + x° + 5x° + 4x - 3° = 360°

Add the like terms.

11x° = 360° + 3°

11x = 363

x = 33°

Then, after we need to put the value of x which is 33 degrees into our solution:

x° + x° + 5x° + 4x - 3° = 360

33° + 33° + 5(33)° + [(4 * 33) - 3°] = 360

33° + 33° + 165° + 132° - 3° = 360

33° + 33° + 165° + 129° = 360

360 = 360 CHECK

Therefore, the measure of the largest angle is 165°.