drewgoat204 drewgoat204

25-06-2018
Mathematics

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25-06-2018

We can see that angle A = angle B

Therefore, we set the two equations equal to each other and solve:
7x+40=3x+112
4x=72
x=18

Then we use x=18 and plug it back in the equation for angle A
7(18)+40=166°

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