Feedback form
Hi! What do you think?

Drag it here or paste with Ctrl+V

    You can also email us on infocalculat.io

    Sin 28 Degrees

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

    What is sin 28°?

    Answer

    sin 28° ≈
    0.4695

    Angle in radians: 28° = 7π/45. The point of the angle is in quadrant I, where sine is positive.

    ≈ — rounded to 4 decimal places. sin 28° can't be written with square roots: 28° is not a multiple of 3°.

    P(cos 28°, sin 28°) ≈ (0.8829, 0.4695)

    xyOP

    P(cos 28°, sin 28°) ≈ (0.8829, 0.4695)

    Highlighted: the projection on the y-axis — sine, y ≈ 0.4695.

    All four functions of 28°
    FunctionExact valueDecimal
    sin 28°—≈ 0.4695
    cos 28°—≈ 0.8829
    tan 28°—≈ 0.5317
    cot 28°—≈ 1.8807

    See Also

    Share This Calculation
    Print
    https://calculat.io/en/number/trigonometry/sin--28Copy
    <a href="https://calculat.io/en/number/trigonometry/sin--28">Sin 28 Degrees: Sine of 28° on the Unit Circle - Calculatio</a>Copy
    Facebook
    Twitter
    Telegram
    WhatsApp
    Viber
    Email
    Sin 28 Degrees: Sine of 28° on the Unit Circle. sin 28° ≈ 0.4695. The sine is the y-coordinate of the point at 28° on the unit circle.
    https://calculat.io/en/number/trigonometry/sin--28/generated.jpgCopy

    Sine of nearby angles

    Anglesin
    25°≈ 0.4226
    26°≈ 0.4384
    27°≈ 0.4540
    28°≈ 0.4695
    29°≈ 0.4848
    30°1/2
    31°≈ 0.5150
    Recalculate with different values ↑

    FAQ

    What is sin 28°?

    sin 28° ≈ 0.4695

    Why does sin 28° 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°. 28° is not, so no such exact form exists; the value is used as a decimal: sin 28° ≈ 0.4695.

    Why does a calculator show 0.2709 for sin 28?

    The calculator is in radian mode (RAD): it takes sin 28 as the sine of 28 radians, sin 28 rad ≈ 0.2709. Switch it to degrees (DEG): sin 28° ≈ 0.4695. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.

    See Also