Tan 20 Degrees
Sin, Cos, Tan, Cot of an Angle
What is tan 20°?
Answer
tan 20° ≈
0.3640
Angle in radians: 20° = π/9. The point of the angle is in quadrant I, where tangent is positive.
≈ — rounded to 4 decimal places. tan 20° can't be written with square roots: 20° is not a multiple of 3°.
tan 20° = sin 20° / cos 20° ≈ 0.3640
P(cos 20°, sin 20°) ≈ (0.9397, 0.3420)
T(1, tan 20°) ≈ (1, 0.3640) — where line OP meets the line x = 1.
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 20°?
tan 20° ≈ 0.3640
Why does tan 20° 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°. 20° is not, so no such exact form exists; the value is used as a decimal: tan 20° ≈ 0.3640.
Why does a calculator show 2.2372 for tan 20?
The calculator is in radian mode (RAD): it takes tan 20 as the tangent of 20 radians, tan 20 rad ≈ 2.2372. Switch it to degrees (DEG): tan 20° ≈ 0.3640. 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 10 Degrees: Tangent of 10° on the Unit Circle
- Tan 11 Degrees: Tangent of 11° on the Unit Circle
- Tan 12 Degrees: Tangent of 12° on the Unit Circle
- Tan 13 Degrees: Tangent of 13° on the Unit Circle
- Tan 14 Degrees: Tangent of 14° on the Unit Circle
- Tan 15 Degrees: Tangent of 15° on the Unit Circle
- Tan 16 Degrees: Tangent of 16° on the Unit Circle
- Tan 17 Degrees: Tangent of 17° on the Unit Circle
- Tan 18 Degrees: Tangent of 18° on the Unit Circle
- Tan 19 Degrees: Tangent of 19° on the Unit Circle
- Tan 21 Degrees: Tangent of 21° on the Unit Circle
- Tan 22 Degrees: Tangent of 22° on the Unit Circle
- Tan 23 Degrees: Tangent of 23° on the Unit Circle
- Tan 24 Degrees: Tangent of 24° on the Unit Circle
- Tan 25 Degrees: Tangent of 25° on the Unit Circle
- Tan 26 Degrees: Tangent of 26° on the Unit Circle
- Tan 27 Degrees: Tangent of 27° on the Unit Circle
- Tan 28 Degrees: Tangent of 28° on the Unit Circle
- Tan 29 Degrees: Tangent of 29° on the Unit Circle
- Tan 30 Degrees: Tangent of 30° on the Unit Circle
- Тангенс 20 градусов (tg 20°) на единичной окружности
- Tangente de 20 grados (tan 20°) en el círculo unitario
- Tangente de 20 graus (tg 20°) no ciclo trigonométrico