m∠R = 130 and m∠S = 80. Find m∠T. The diagram is not to scale.
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(I will use the < sign for angle since I don't know how to type the angle symbol :( )
Since this is a 4 sided figure, the angles inside will add to 360 degrees (like a square or rectangle).
Note that angle U and angle S have the same value and that the sum of the angles of the quadrilateral is 360 degrees.
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Good subtraction :) 70 degrees is correct.
But more importantly, realize that if they give you a 4-sided figure, the angles inside will add to 360. If it's symmetric, then you can use that to help... the corresponding angles and sides will be equal. If an angle bisects a larger angle, you know the measures of the small parts are half of the larger angle.
Just use what you know... these problems aren't supposed to be too tough, but you do have to think a little about what is going on.