Find the value of side b, the value of angle A,  and the value of angle B.

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The length of side b can be calculated in two ways:

1. Using the Pythagorean theorem

`b=sqrt(25^2-20^2)=15`

2. Noting that this triangle is a multiple of a 3-4-5 right triangle where the legs are 3 and 4 and the...

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