Secant Calculator
Calculate the secant of an angle in degrees, radians or gradians. The secant is the reciprocal of the cosine.
What is Secant?
Secant is the reciprocal of cosine: sec(θ) = 1 / cos(θ). In a right triangle, it is the ratio of the hypotenuse to the adjacent side.
Notable values: sec(0°) = 1, sec(60°) = 2, sec(45°) ≈ 1.4142. Secant is undefined where cos(θ) = 0, i.e. 90°, 270° and odd multiples of 90°.
Unit conversions: 1° = π/180 rad ≈ 0.01745 rad. 1 rad = 180°/π ≈ 57.296°. 400 gradians = 360°.
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