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    Cos 55 Degrees

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

    What is cos 55°?

    Answer

    cos 55° ≈
    0.5736

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

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

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

    xyOP

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

    Highlighted: the projection on the x-axis — cosine, x ≈ 0.5736.

    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/cos--55Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--55">Cos 55 Degrees: Cosine of 55° on the Unit Circle</a>Copy
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    Cos 55 Degrees: Cosine of 55° on the Unit Circle. cos 55° ≈ 0.5736. The cosine is the x-coordinate of the point at 55° on the unit circle.
    https://calculat.io/en/number/trigonometry/cos--55/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    52°≈ 0.6157
    53°≈ 0.6018
    54°√(10 − 2√5)/4
    55°≈ 0.5736
    56°≈ 0.5592
    57°≈ 0.5446
    58°≈ 0.5299
    Recalculate with different values ↑

    FAQ

    What is cos 55°?

    cos 55° ≈ 0.5736

    Why does cos 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: cos 55° ≈ 0.5736.

    Why does a calculator show 0.0221 for cos 55?

    The calculator is in radian mode (RAD): it takes cos 55 as the cosine of 55 radians, cos 55 rad ≈ 0.0221. Switch it to degrees (DEG): cos 55° ≈ 0.5736. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also