📐 Trigonometric Calculator (Radian)

Calculate trigonometric function values based on radians in an equilateral triangle.

Radian Input Method Radian Value

Radian-Based Trigonometric Functions

You can enter the angle directly in radians (rad) or in the π/n form.

sin θ = 대변 / 빗변

cos θ = 밑변 / 빗변

tan θ = sin θ / cos θ

1 rad = 180/π ≈ 57.296°

1° = π/180 ≈ 0.017453 rad

e^(iθ) = cos θ + i·sin θ

Using radians, Euler's formula holds naturally. When θ=π, e^(iπ) + 1 = 0.