Cos 145 Degrees
Sin, Cos, Tan, Cot of an Angle
What is cos 145°?
Answer
cos 145° ≈
−0.8192
Angle in radians: 145° = 29π/36. The point of the angle is in quadrant II, where cosine is negative.
≈ — rounded to 4 decimal places. cos 145° can't be written with square roots: 145° is not a multiple of 3°.
cos 145° = cos(180° − 35°) = −cos 35° ≈ −0.8192
P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)
P(cos 145°, sin 145°) ≈ (−0.8192, 0.5736)
Highlighted: the projection on the x-axis — cosine, x ≈ −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
Cosine of nearby angles
FAQ
What is cos 145°?
cos 145° ≈ −0.8192
Why does cos 145° 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°. 145° is not, so no such exact form exists; the value is used as a decimal: cos 145° ≈ −0.8192.
Why does a calculator show 0.8839 for cos 145?
The calculator is in radian mode (RAD): it takes cos 145 as the cosine of 145 radians, cos 145 rad ≈ 0.8839. Switch it to degrees (DEG): cos 145° ≈ −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
- Cos 120 Degrees: Cosine of 120° on the Unit Circle
- Cos 125 Degrees: Cosine of 125° on the Unit Circle
- Cos 126 Degrees: Cosine of 126° on the Unit Circle
- Cos 127 Degrees: Cosine of 127° on the Unit Circle
- Cos 130 Degrees: Cosine of 130° on the Unit Circle
- Cos 134 Degrees: Cosine of 134° on the Unit Circle
- Cos 135 Degrees: Cosine of 135° on the Unit Circle
- Cos 140 Degrees: Cosine of 140° on the Unit Circle
- Cos 142 Degrees: Cosine of 142° on the Unit Circle
- Cos 144 Degrees: Cosine of 144° on the Unit Circle
- Cos 150 Degrees: Cosine of 150° on the Unit Circle
- Cos 159 Degrees: Cosine of 159° on the Unit Circle
- Cos 160 Degrees: Cosine of 160° on the Unit Circle
- Cos 162 Degrees: Cosine of 162° on the Unit Circle
- Cos 164 Degrees: Cosine of 164° on the Unit Circle
- Cos 165 Degrees: Cosine of 165° on the Unit Circle
- Cos 167 Degrees: Cosine of 167° on the Unit Circle
- Cos 175 Degrees: Cosine of 175° on the Unit Circle
- Cos 179 Degrees: Cosine of 179° on the Unit Circle
- Cos 180 Degrees: Cosine of 180° on the Unit Circle
- Косинус 145 градусов (cos 145°) на единичной окружности
- Coseno de 145 grados (cos 145°) en el círculo unitario
- Cosseno de 145 graus (cos 145°) no ciclo trigonométrico