Aquadrilateral has angles that measure 101°, 133°, and 76°. what is the measure of the fourth angle?

Quadrilateral has to equal 360 degrees.

So simply subtract. 

360 - 101 - 133 - 76 equals... 50

Then you can add to see if they all equal 360.

101 + 133 + 76 + 50 = 360

So the answer is 50.

Hope this helps. c:

The sum of angles in a quadrilateral = 360 degrees.

Let the fourth angle be y

101 + 133 + 76 + y = 360

310 + y = 360

y = 360 - 310

y =50

Therefore the fourth angle is 50°

Hope this explains it.