Arccos of 2/3
Arcsin, Arccos, Arctan, Arccot
What is arccos(2/3)?
Answer
arccos(2/3) ≈
48.1897° ≈ 0.8411 rad
Range: arccos x is an angle from 0° to 180°, so the answer is unique.
≈ — the value is not a table one; rounded to 4 decimal places.
arccos(2/3) is the angle α in [0°, 180°] with cos α = 2/3.
cos 48.1897° ≈ 0.6667
α = arccos(2/3) ≈ 48.1897°
P ≈ (0.6667, 0.7454)
P lies on the line x = 2/3 in the upper half of the circle, where sin α ≥ 0; highlighted: cos α = 2/3.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(2/3) | ≈ 41.8103° | ≈ 0.7297 |
| arccos(2/3) | ≈ 48.1897° | ≈ 0.8411 |
| arctan(2/3) | ≈ 33.6901° | ≈ 0.5880 |
| arccot(2/3) | ≈ 56.3099° | ≈ 0.9828 |
See Also
- Sin, Cos, Tan, Cot of an Angle - Exact value in square roots and the decimal, with reduction to an acute angle on 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
Arccosine of nearby values
| x | arccos x |
|---|---|
| √3/3 | ≈ 54.7356° |
| 3/5 | ≈ 53.1301° |
| 0.65 | ≈ 49.4584° |
| 2/3 | ≈ 48.1897° |
| 0.7 | ≈ 45.5730° |
| √2/2 | 45° = π/4 |
| 3/4 | ≈ 41.4096° |
FAQ
What is arccos(2/3)?
arccos(2/3) ≈ 48.1897° ≈ 0.8411 rad
How to convert arccos(2/3) to radians?
Multiply the angle in degrees by π/180: 48.1897° × π/180 ≈ 0.8411 rad.
Why does a calculator show 0.8411 for arccos(2/3)?
The calculator is in radian mode (RAD) and gives the angle in radians: arccos(2/3) ≈ 0.8411 rad. In degrees (DEG) it is ≈ 48.1897°.
See Also
- Arccos of 0.9 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.14 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.55 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.65 (Inverse Cosine) in Degrees and Radians
- Arccos of 1 (Inverse Cosine) in Degrees and Radians
- Arccos of 1/2 (Inverse Cosine) in Degrees and Radians
- Arccos of 1/3 (Inverse Cosine) in Degrees and Radians
- Arccos of 1/4 (Inverse Cosine) in Degrees and Radians
- Arccos of 1/5 (Inverse Cosine) in Degrees and Radians
- Arccos of 2 (Inverse Cosine) in Degrees and Radians
- Arccos of 2/5 (Inverse Cosine) in Degrees and Radians
- Arccos of 3/4 (Inverse Cosine) in Degrees and Radians
- Arccos of 3/5 (Inverse Cosine) in Degrees and Radians
- Arccos of 4/5 (Inverse Cosine) in Degrees and Radians
- Arccos of 4/7 (Inverse Cosine) in Degrees and Radians
- Arccos of 12/13 (Inverse Cosine) in Degrees and Radians
- Arccos of 60 (Inverse Cosine) in Degrees and Radians
- Arccos of √2/2 (Inverse Cosine) in Degrees and Radians
- Arccos of √3/2 (Inverse Cosine) in Degrees and Radians
- Arccos of √3/3 (Inverse Cosine) in Degrees and Radians
- Арккосинус 2/3 (arccos 2/3) в градусах и радианах
- Arcocoseno de 2/3 (arccos 2/3) en grados y radianes
- Arco cosseno de 2/3 (arccos 2/3) em graus e radianos