Answer:
Part a)

Part b)

Explanation:
step 1
Find the length side BC
Applying the law of sines
we know that

we have



substitute

solve for BC


step 2
Find the measure of angle B
we know that
The sum of the interior angles in a triangle must be equal to 180 degrees
so

substitute the given values




step 3
Find the length side AC
Applying the law of sines
we know that

we have



substitute

solve for AC

