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jmc

prealgebra senior

Problem

In quadrilateral , angle and angle are trisected as shown. What is the degree measure of angle ?

problem
Solution
Triangle must have a total angle measure of . We know that the other two angles have measures of and , so angle must have a measure of degrees. We now look at quadrilateral , whose interior angle measures must sum to . Therefore, we have that , so . We want to find , so we multiply both sides of the equation by to get that . We can now substitute in for to find that the measure of angle is degrees.
Final answer
80