I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS AND EXPLAIN WHY THAT IS THE ANSWER

Answer:
27°
Step-by-step explanation:
SOH CAH TOA
sinx = opposite/hypotenuse
sinx = 10/21 ≈ 0.47619047619 radians
0.47619047619 · (180/π)
≈ 85.71/π
≈ 27°