Answer: 3/5.
- A 3/5
- B 4/5
- C 3/4
- D 5/3
Correct answer: A. 3/5
Explanation: sin θ = opposite/hypotenuse = 3/5. This is a 3-4-5 Pythagorean triple.
Unit circle with standard angles 0, 30, 45, 60, 90 degrees; at 45 degrees the point is (cos45, sin45) = (1/sqrt2, 1/sqrt2).
Concept context
Ratios, identities, and applications in triangles