Cos 270 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 270°?
Answer
cos 270° =
0
Angle in radians: 270° = 3π/2. The point of the angle is on the y-axis: (0, −1).
P(cos 270°, sin 270°) = (0, −1)
P(cos 270°, sin 270°) = (0, −1)
The point lies on the y-axis, so its projection on the x-axis is 0: cos 270° = 0.
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 270°?
cos 270° = 0
Why is cos 270° equal to 0?
The point of 270° on the unit circle is (0, −1), and cosine is its the x-coordinate, so cos 270° = 0.
Why does a calculator show 0.9844 for cos 270?
The calculator is in radian mode (RAD): it takes cos 270 as the cosine of 270 radians, cos 270 rad ≈ 0.9844. Switch it to degrees (DEG): cos 270° = 0. 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 210 Degrees: Cosine of 210° on the Unit Circle
- Cos 211 Degrees: Cosine of 211° on the Unit Circle
- Cos 215 Degrees: Cosine of 215° on the Unit Circle
- Cos 216 Degrees: Cosine of 216° on the Unit Circle
- Cos 225 Degrees: Cosine of 225° on the Unit Circle
- Cos 227 Degrees: Cosine of 227° on the Unit Circle
- Cos 234 Degrees: Cosine of 234° on the Unit Circle
- Cos 240 Degrees: Cosine of 240° on the Unit Circle
- Cos 252 Degrees: Cosine of 252° on the Unit Circle
- Cos 255 Degrees: Cosine of 255° on the Unit Circle
- Cos 285 Degrees: Cosine of 285° on the Unit Circle
- Cos 288 Degrees: Cosine of 288° on the Unit Circle
- Cos 300 Degrees: Cosine of 300° on the Unit Circle
- Cos 306 Degrees: Cosine of 306° on the Unit Circle
- Cos 315 Degrees: Cosine of 315° on the Unit Circle
- Cos 324 Degrees: Cosine of 324° on the Unit Circle
- Cos 330 Degrees: Cosine of 330° on the Unit Circle
- Cos 341 Degrees: Cosine of 341° on the Unit Circle
- Cos 342 Degrees: Cosine of 342° on the Unit Circle
- Cos 345 Degrees: Cosine of 345° on the Unit Circle
- Косинус 270 градусов (cos 270°) на единичной окружности
- Coseno de 270 grados (cos 270°) en el círculo unitario
- Cosseno de 270 graus (cos 270°) no ciclo trigonométrico