Cos 55 Degrees
Sin, Cos, Tan, Cot of an 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)
P(cos 55°, sin 55°) ≈ (0.5736, 0.8192)
Highlighted: the projection on the x-axis — cosine, x ≈ 0.5736.
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 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
- Cos 45 Degrees: Cosine of 45° on the Unit Circle
- Cos 46 Degrees: Cosine of 46° on the Unit Circle
- Cos 47 Degrees: Cosine of 47° on the Unit Circle
- Cos 48 Degrees: Cosine of 48° on the Unit Circle
- Cos 49 Degrees: Cosine of 49° on the Unit Circle
- Cos 50 Degrees: Cosine of 50° on the Unit Circle
- Cos 51 Degrees: Cosine of 51° on the Unit Circle
- Cos 52 Degrees: Cosine of 52° on the Unit Circle
- Cos 53 Degrees: Cosine of 53° on the Unit Circle
- Cos 54 Degrees: Cosine of 54° on the Unit Circle
- Cos 56 Degrees: Cosine of 56° on the Unit Circle
- Cos 57 Degrees: Cosine of 57° on the Unit Circle
- Cos 58 Degrees: Cosine of 58° on the Unit Circle
- Cos 59 Degrees: Cosine of 59° on the Unit Circle
- Cos 60 Degrees: Cosine of 60° on the Unit Circle
- Cos 61 Degrees: Cosine of 61° on the Unit Circle
- Cos 62 Degrees: Cosine of 62° on the Unit Circle
- Cos 63 Degrees: Cosine of 63° on the Unit Circle
- Cos 64 Degrees: Cosine of 64° on the Unit Circle
- Cos 65 Degrees: Cosine of 65° on the Unit Circle
- Косинус 55 градусов (cos 55°) на единичной окружности
- Coseno de 55 grados (cos 55°) en el círculo unitario
- Cosseno de 55 graus (cos 55°) no ciclo trigonométrico