Tan 180 Degrees
Sin, Cos, Tan, Cot of an Angle
What is tan 180°?
Answer
tan 180° =
0
Angle in radians: 180° = π. The point of the angle is on the x-axis: (−1, 0).
tan 180° = sin 180° / cos 180° = 0 / (−1) = 0
P(cos 180°, sin 180°) = (−1, 0)
T(1, tan 180°) = (1, 0) — where line OP meets the line x = 1, on the extension of the ray beyond O (dashed).
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
Tangent of nearby angles
FAQ
What is tan 180°?
tan 180° = 0
Why is tan 180° equal to 0?
The point of 180° on the unit circle is (−1, 0), and tan = y / x = 0 / (−1) = 0.
Why does a calculator show 1.3387 for tan 180?
The calculator is in radian mode (RAD): it takes tan 180 as the tangent of 180 radians, tan 180 rad ≈ 1.3387. Switch it to degrees (DEG): tan 180° = 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
- Tan 145 Degrees: Tangent of 145° on the Unit Circle
- Tan 150 Degrees: Tangent of 150° on the Unit Circle
- Tan 159 Degrees: Tangent of 159° on the Unit Circle
- Tan 160 Degrees: Tangent of 160° on the Unit Circle
- Tan 162 Degrees: Tangent of 162° on the Unit Circle
- Tan 164 Degrees: Tangent of 164° on the Unit Circle
- Tan 165 Degrees: Tangent of 165° on the Unit Circle
- Tan 167 Degrees: Tangent of 167° on the Unit Circle
- Tan 175 Degrees: Tangent of 175° on the Unit Circle
- Tan 179 Degrees: Tangent of 179° on the Unit Circle
- Tan 195 Degrees: Tangent of 195° on the Unit Circle
- Tan 198 Degrees: Tangent of 198° on the Unit Circle
- Tan 200 Degrees: Tangent of 200° on the Unit Circle
- Tan 210 Degrees: Tangent of 210° on the Unit Circle
- Tan 211 Degrees: Tangent of 211° on the Unit Circle
- Tan 215 Degrees: Tangent of 215° on the Unit Circle
- Tan 216 Degrees: Tangent of 216° on the Unit Circle
- Tan 225 Degrees: Tangent of 225° on the Unit Circle
- Tan 227 Degrees: Tangent of 227° on the Unit Circle
- Tan 234 Degrees: Tangent of 234° on the Unit Circle
- Тангенс 180 градусов (tg 180°) на единичной окружности
- Tangente de 180 grados (tan 180°) en el círculo unitario
- Tangente de 180 graus (tg 180°) no ciclo trigonométrico