see the figure below to better understand the problem
step 1
Find out the value of c
Applying the Pythagorean Theorem
step 2
Find the measure of angle A
step 3
Find out the measure of angle B
Remember that
A+B+C=180 degrees
A=3.6
C=90
substitute
3.6+B+90=180
B=180-93.6
B=86.4 degrees
therefore
c=19.34
A=3.6 degrees
B=86.4 degrees