Sin 55 Degrees
Sin, Cos, Tan, Cot of an Angle
What is sin 55°?
Answer
sin 55° ≈
0.8192
Angle in radians: 55° = 11π/36. The point of the angle is in quadrant I, where sine is positive.
≈ — rounded to 4 decimal places. sin 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 y-axis — sine, y ≈ 0.8192.
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
Sine of nearby angles
FAQ
What is sin 55°?
sin 55° ≈ 0.8192
Why does sin 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: sin 55° ≈ 0.8192.
Why does a calculator show −0.9998 for sin 55?
The calculator is in radian mode (RAD): it takes sin 55 as the sine of 55 radians, sin 55 rad ≈ −0.9998. Switch it to degrees (DEG): sin 55° ≈ 0.8192. In radians the value is never undefined: π is irrational, so a whole number of radians never lands exactly on an axis.
See Also
- Sin 45 Degrees: Sine of 45° on the Unit Circle
- Sin 46 Degrees: Sine of 46° on the Unit Circle
- Sin 47 Degrees: Sine of 47° on the Unit Circle
- Sin 48 Degrees: Sine of 48° on the Unit Circle
- Sin 49 Degrees: Sine of 49° on the Unit Circle
- Sin 50 Degrees: Sine of 50° on the Unit Circle
- Sin 51 Degrees: Sine of 51° on the Unit Circle
- Sin 52 Degrees: Sine of 52° on the Unit Circle
- Sin 53 Degrees: Sine of 53° on the Unit Circle
- Sin 54 Degrees: Sine of 54° on the Unit Circle
- Sin 56 Degrees: Sine of 56° on the Unit Circle
- Sin 57 Degrees: Sine of 57° on the Unit Circle
- Sin 58 Degrees: Sine of 58° on the Unit Circle
- Sin 59 Degrees: Sine of 59° on the Unit Circle
- Sin 60 Degrees: Sine of 60° on the Unit Circle
- Sin 61 Degrees: Sine of 61° on the Unit Circle
- Sin 62 Degrees: Sine of 62° on the Unit Circle
- Sin 63 Degrees: Sine of 63° on the Unit Circle
- Sin 64 Degrees: Sine of 64° on the Unit Circle
- Sin 65 Degrees: Sine of 65° on the Unit Circle
- Синус 55 градусов (sin 55°) на единичной окружности
- Seno de 55 grados (sen 55°) en el círculo unitario
- Seno de 55 graus (sen 55°) no ciclo trigonométrico