In a right triangle ABC, C = 90°, a = 21 ft and b = 76 ft. Solve for all the missing parts using the given information. (Round each answer to the nearest whole number.)
I am not certain of your level in trig.
TanB=76/21
so B= arctan (76/21)
A= 90-B
c= sqrt(21^1+76^2) or c= 21/sinB
There are a number of other ways to solve this.