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    Tan 55 Degrees

    Sin, Cos, Tan, Cot of an Angle
    Function
    Angle (°)

    What is tan 55°?

    Answer

    tan 55° ≈
    1.4281

    Angle in radians: 55° = 11π/36. The point of the angle is in quadrant I, where tangent is positive.

    ≈ — rounded to 4 decimal places. tan 55° can't be written with square roots: 55° is not a multiple of 3°.

    tan 55° = sin 55° / cos 55° ≈ 1.4281

    xyOP

    P(cos 55°, sin 55°) ≈ (0.5736, 0.8192)

    T(1, tan 55°) ≈ (1, 1.4281) — where line OP meets the line x = 1.

    All four functions of 55°
    FunctionExact valueDecimal
    sin 55°—≈ 0.8192
    cos 55°—≈ 0.5736
    tan 55°—≈ 1.4281
    cot 55°—≈ 0.7002

    See Also

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    https://calculat.io/en/number/trigonometry/tan--55Copy
    <a href="https://calculat.io/en/number/trigonometry/tan--55">Tan 55 Degrees: Tangent of 55° on the Unit Circle</a>Copy
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    Tan 55 Degrees: Tangent of 55° on the Unit Circle. tan 55° ≈ 1.4281. The tangent is the ratio y/x of the point at 55° on the unit circle.
    https://calculat.io/en/number/trigonometry/tan--55/generated.jpgCopy

    Tangent of nearby angles

    Angletan
    52°≈ 1.2799
    53°≈ 1.3270
    54°√(25 + 10√5)/5
    55°≈ 1.4281
    56°≈ 1.4826
    57°≈ 1.5399
    58°≈ 1.6003
    Recalculate with different values ↑

    FAQ

    What is tan 55°?

    tan 55° ≈ 1.4281

    Why does tan 55° have no exact value?

    A trigonometric value of a whole number of degrees can be written with square roots only when the angle is a multiple of 3°. 55° is not, so no such exact form exists; the value is used as a decimal: tan 55° ≈ 1.4281.

    Why does a calculator show −45.1831 for tan 55?

    The calculator is in radian mode (RAD): it takes tan 55 as the tangent of 55 radians, tan 55 rad ≈ −45.1831. Switch it to degrees (DEG): tan 55° ≈ 1.4281. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also