Answer: 1.
- A 1/√2
- B √3
- C 1
- D 0
Correct answer: C. 1
Explanation: tan 45° = 1. In an isosceles right triangle, opposite = adjacent, so ratio = 1.
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