SOLUTION: well, its not really from the book but i just hope that someone could help me anyway. it is off a study guid for school for a semester test. There is a Trapezoid and the measure of

Question 117362This question is from textbook McDougal Littell Geometry
: well, its not really from the book but i just hope that someone could help me anyway. it is off a study guid for school for a semester test. There is a Trapezoid and the measure of angle A= 90 degrees.the measure of angle C= 50 degrees. the measure of angle D= 90, and find the measure of angle B? that is the best way that i can explain it because there is a picture that goes with it and i cant get it on the computer. This question is from textbook McDougal Littell Geometry

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Let x=angle measure of angle B

A trapezoid has 4 sides. So this means that the sum of all 4 angles is 360 degrees. So this means

Now plug in the given values

Combine like terms on the left side

Subtract 230 from both sides

Combine like terms on the right side

--------------------------------------------------------------
Answer:
So our answer is

So the measure of angle B is 130 degrees
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