Cos(60°) = 1/2
Cosine — the x-coordinate of the corresponding unit-circle point, or adjacent/hypotenuse in a right triangle.
How to derive cos(60°)
In the 30-60-90 triangle (sides 1, √3, 2), the side adjacent to 60° has length 1, so cos(60°) = 1/2. Cofunction view: cos(60°) = sin(30°) = 1/2.
Unit-circle context
The angle 60° corresponds to π/3 radians and sits Quadrant I on the unit circle.
Other trig values at 60°
Related cos values
Frequently asked
- What is the exact value of cos(60°)?
- The exact value is 1/2. Its decimal approximation is 0.5.
- How do you derive cos(60°)?
- In the 30-60-90 triangle (sides 1, √3, 2), the side adjacent to 60° has length 1, so cos(60°) = 1/2. Cofunction view: cos(60°) = sin(30°) = 1/2.
- What is 60° in radians?
- 60° equals π/3 radians (multiply degrees by π/180).
Need to solve any cos problem step by step?
Open the AI Trigonometry Solver — type or upload any problem, get step-by-step explanations free.