Tan 125 Degrees
Sin, Cos, Tan, Cot of an Angle
What is tan 125°?
Answer
tan 125° ≈
−1.4281
Angle in radians: 125° = 25π/36. The point of the angle is in quadrant II, where tangent is negative.
≈ — rounded to 4 decimal places. tan 125° can't be written with square roots: 125° is not a multiple of 3°.
tan 125° = tan(180° − 55°) = −tan 55° ≈ −1.4281
tan 125° = sin 125° / cos 125° ≈ −1.4281
P(cos 125°, sin 125°) ≈ (−0.5736, 0.8192)
T(1, tan 125°) ≈ (1, −1.4281) — 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 125°?
tan 125° ≈ −1.4281
Why does tan 125° 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°. 125° is not, so no such exact form exists; the value is used as a decimal: tan 125° ≈ −1.4281.
Why does a calculator show −0.7821 for tan 125?
The calculator is in radian mode (RAD): it takes tan 125 as the tangent of 125 radians, tan 125 rad ≈ −0.7821. Switch it to degrees (DEG): tan 125° ≈ −1.4281. 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 90 Degrees: Tangent of 90° on the Unit Circle
- Tan 97 Degrees: Tangent of 97° on the Unit Circle
- Tan 98 Degrees: Tangent of 98° on the Unit Circle
- Tan 100 Degrees: Tangent of 100° on the Unit Circle
- Tan 101 Degrees: Tangent of 101° on the Unit Circle
- Tan 105 Degrees: Tangent of 105° on the Unit Circle
- Tan 106 Degrees: Tangent of 106° on the Unit Circle
- Tan 108 Degrees: Tangent of 108° on the Unit Circle
- Tan 110 Degrees: Tangent of 110° on the Unit Circle
- Tan 120 Degrees: Tangent of 120° on the Unit Circle
- Tan 126 Degrees: Tangent of 126° on the Unit Circle
- Tan 127 Degrees: Tangent of 127° on the Unit Circle
- Tan 130 Degrees: Tangent of 130° on the Unit Circle
- Tan 134 Degrees: Tangent of 134° on the Unit Circle
- Tan 135 Degrees: Tangent of 135° on the Unit Circle
- Tan 140 Degrees: Tangent of 140° on the Unit Circle
- Tan 142 Degrees: Tangent of 142° on the Unit Circle
- Tan 144 Degrees: Tangent of 144° on the Unit Circle
- Tan 145 Degrees: Tangent of 145° on the Unit Circle
- Tan 150 Degrees: Tangent of 150° on the Unit Circle
- Тангенс 125 градусов (tg 125°) на единичной окружности
- Tangente de 125 grados (tan 125°) en el círculo unitario
- Tangente de 125 graus (tg 125°) no ciclo trigonométrico