In the right triangle below, tana = 0.45. what is the approximate length of ab?

In the right triangle ABC wherein AB is the hypotenuse, BC is the opposite and CA is the adjacent tanA=0.45. The approximate length of AB which is the hypotenuse is 22, Opposite (BC) is 9 and Adjacent (CA) is 20. You need to use pythagorean formula in getting the length of AB.

YOUR ANSWER IS (22).

the correct answer is D: 22 units

I think it's A : more than $0 but less than $4100