help please thank you so much

Question

2.

If s = 7 cm and t = 9 cm, what is the measure of angle ?

 A. 39°

 B. 51°

 C. 34°

 D. 56°

Answer 1

θ = sin^-1 (7 / 9) s / t is equal to the sin of angle θ

θ = 51.06º

The answer is B. 51º