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    Cos 130 Degrees

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

    What is cos 130°?

    Answer

    cos 130° ≈
    −0.6428

    Angle in radians: 130° = 13π/18. The point of the angle is in quadrant II, where cosine is negative.

    ≈ — rounded to 4 decimal places. cos 130° can't be written with square roots: 130° is not a multiple of 3°.

    cos 130° = cos(180° − 50°) = −cos 50° ≈ −0.6428

    P(cos 130°, sin 130°) ≈ (−0.6428, 0.7660)

    xyOP

    P(cos 130°, sin 130°) ≈ (−0.6428, 0.7660)

    Highlighted: the projection on the x-axis — cosine, x ≈ −0.6428.

    All four functions of 130°
    FunctionExact valueDecimal
    sin 130°—≈ 0.7660
    cos 130°—≈ −0.6428
    tan 130°—≈ −1.1918
    cot 130°—≈ −0.8391

    Reference angle: cos 50° ≈ 0.6428

    See Also

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    https://calculat.io/en/number/trigonometry/cos--130Copy
    <a href="https://calculat.io/en/number/trigonometry/cos--130">Cos 130 Degrees: Cosine of 130° on the Unit Circle</a>Copy
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    Cos 130 Degrees: Cosine of 130° on the Unit Circle. cos 130° ≈ −0.6428. The cosine is the x-coordinate of the point at 130° on the unit circle; 130° reduces to 50°.
    https://calculat.io/en/number/trigonometry/cos--130/generated.jpgCopy

    Cosine of nearby angles

    Anglecos
    125°≈ −0.5736
    126°−√(10 − 2√5)/4
    127°≈ −0.6018
    130°≈ −0.6428
    134°≈ −0.6947
    135°−√2/2
    140°≈ −0.7660
    Recalculate with different values ↑

    FAQ

    What is cos 130°?

    cos 130° ≈ −0.6428

    Why does cos 130° 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°. 130° is not, so no such exact form exists; the value is used as a decimal: cos 130° ≈ −0.6428.

    Why does a calculator show −0.3673 for cos 130?

    The calculator is in radian mode (RAD): it takes cos 130 as the cosine of 130 radians, cos 130 rad ≈ −0.3673. Switch it to degrees (DEG): cos 130° ≈ −0.6428. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also