Cos 31 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 31°?
Answer
cos 31° ≈
0.8572
Angle in radians: 31° = 31π/180. The point of the angle is in quadrant I, where cosine is positive.
≈ — rounded to 4 decimal places. cos 31° can't be written with square roots: 31° is not a multiple of 3°.
P(cos 31°, sin 31°) ≈ (0.8572, 0.5150)
P(cos 31°, sin 31°) ≈ (0.8572, 0.5150)
Highlighted: the projection on the x-axis — cosine, x ≈ 0.8572.
See Also
- Arcsin, Arccos, Arctan, Arccot - The angle from the value of its sine, cosine, tangent or cotangent: exact in degrees and π, with the check and the unit circle
- Square Root Calculator - Calculate the square root of any number
- Simplify Square Root Calculator - Write any square root in simplest radical form, step by step
- Geometry Formulas: Area, Volume, Perimeter - The formula for every standard shape, where it comes from, and worked examples
Cosine of nearby angles
FAQ
What is cos 31°?
cos 31° ≈ 0.8572
Why does cos 31° 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°. 31° is not, so no such exact form exists; the value is used as a decimal: cos 31° ≈ 0.8572.
Why does a calculator show 0.9147 for cos 31?
The calculator is in radian mode (RAD): it takes cos 31 as the cosine of 31 radians, cos 31 rad ≈ 0.9147. Switch it to degrees (DEG): cos 31° ≈ 0.8572. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.
See Also
- Cos 21 Degrees: Cosine of 21° on the Unit Circle
- Cos 22 Degrees: Cosine of 22° on the Unit Circle
- Cos 23 Degrees: Cosine of 23° on the Unit Circle
- Cos 24 Degrees: Cosine of 24° on the Unit Circle
- Cos 25 Degrees: Cosine of 25° on the Unit Circle
- Cos 26 Degrees: Cosine of 26° on the Unit Circle
- Cos 27 Degrees: Cosine of 27° on the Unit Circle
- Cos 28 Degrees: Cosine of 28° on the Unit Circle
- Cos 29 Degrees: Cosine of 29° on the Unit Circle
- Cos 30 Degrees: Cosine of 30° on the Unit Circle
- Cos 32 Degrees: Cosine of 32° on the Unit Circle
- Cos 33 Degrees: Cosine of 33° on the Unit Circle
- Cos 34 Degrees: Cosine of 34° on the Unit Circle
- Cos 35 Degrees: Cosine of 35° on the Unit Circle
- Cos 36 Degrees: Cosine of 36° on the Unit Circle
- Cos 37 Degrees: Cosine of 37° on the Unit Circle
- Cos 38 Degrees: Cosine of 38° on the Unit Circle
- Cos 39 Degrees: Cosine of 39° on the Unit Circle
- Cos 40 Degrees: Cosine of 40° on the Unit Circle
- Cos 41 Degrees: Cosine of 41° on the Unit Circle
- Косинус 31 градуса (cos 31°) на единичной окружности
- Coseno de 31 grados (cos 31°) en el círculo unitario
- Cosseno de 31 graus (cos 31°) no ciclo trigonométrico