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    Sin 145 Degrees

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

    What is sin 145°?

    Answer

    sin 145° ≈
    0.5736

    Angle in radians: 145° = 29π/36. The point of the angle is in quadrant II, where sine is positive.

    ≈ — rounded to 4 decimal places. sin 145° can't be written with square roots: 145° is not a multiple of 3°.

    sin 145° = sin(180° − 35°) = sin 35° ≈ 0.5736

    P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)

    xyOP

    P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)

    Highlighted: the projection on the y-axis — sine, y ≈ 0.5736.

    All four functions of 145°
    FunctionExact valueDecimal
    sin 145°—≈ 0.5736
    cos 145°—≈ −0.8192
    tan 145°—≈ −0.7002
    cot 145°—≈ −1.4281

    Reference angle: sin 35° ≈ 0.5736

    See Also

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    https://calculat.io/en/number/trigonometry/sin--145Copy
    <a href="https://calculat.io/en/number/trigonometry/sin--145">Sin 145 Degrees: Sine of 145° on the Unit Circle</a>Copy
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    Sin 145 Degrees: Sine of 145° on the Unit Circle. sin 145° ≈ 0.5736. The sine is the y-coordinate of the point at 145° on the unit circle; 145° reduces to 35°.
    https://calculat.io/en/number/trigonometry/sin--145/generated.jpgCopy

    Sine of nearby angles

    Anglesin
    140°≈ 0.6428
    142°≈ 0.6157
    144°√(10 − 2√5)/4
    145°≈ 0.5736
    150°1/2
    159°≈ 0.3584
    160°≈ 0.3420
    Recalculate with different values ↑

    FAQ

    What is sin 145°?

    sin 145° ≈ 0.5736

    Why does sin 145° 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°. 145° is not, so no such exact form exists; the value is used as a decimal: sin 145° ≈ 0.5736.

    Why does a calculator show 0.4677 for sin 145?

    The calculator is in radian mode (RAD): it takes sin 145 as the sine of 145 radians, sin 145 rad ≈ 0.4677. Switch it to degrees (DEG): sin 145° ≈ 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