SOLUTION: A quadrilateral has three angles that measure 90 degrees , 100 degrees , and 120 degrees. Which is the measure of the fourth angle?
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Question 391374: A quadrilateral has three angles that measure 90 degrees , 100 degrees , and 120 degrees. Which is the measure of the fourth angle?
Found 2 solutions by gioxi, solver91311:
Answer by gioxi(1) (Show Source): You can put this solution on YOUR website!
Add the given angles together and subtract from 360 degrees.
A°+B°+C°+D°=360°
360°-120-100-90=50°
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The interior angles of any quadrilateral have a sum equal to 
John
My calculator said it, I believe it, that settles it
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