Solve for a and b pls and ty

Solve through trigonmetry:

Im writing the 3 root as 3 because my computer doesnt have the root...though i'll add it in the calculator

For b

Tan-theta= P/B

tan45= 3/b

btan45=3

b=3/tan45

b= 1.73

For a

Sin-theta= P/H

sin45= 3/a

asin45=3

a= 3/sin45

a= 2.45

i believe b is the answer