Two angles of a quadrilateral measure 140° and 30°. The other two angles are in a ratio of 9:10. What are the measures of those two angles?

Answer 1

The total of the measures of 4 angles is 360 degree, so you can get the sum of the other two angles, let's say it is x + y.

And, we are given: x: y = 9:10.

Solve the equations to get x and y.