Arccos of 0.9
Arcsin, Arccos, Arctan, Arccot
What is arccos(0.9)?
Answer
arccos(0.9) ≈
25.8419° ≈ 0.4510 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(0.9) is the angle α in [0°, 180°] with cos α = 0.9.
cos 25.8419° ≈ 0.9000
α = arccos(0.9) ≈ 25.8419°
P ≈ (0.9, 0.4359)
P lies on the line x = 0.9 in the upper half of the circle, where sin α ≥ 0; highlighted: cos α = 0.9.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(0.9) | ≈ 64.1581° | ≈ 1.1198 |
| arccos(0.9) | ≈ 25.8419° | ≈ 0.4510 |
| arctan(0.9) | ≈ 41.9872° | ≈ 0.7328 |
| arccot(0.9) | ≈ 48.0128° | ≈ 0.8380 |
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 |
|---|---|
| 3/4 | ≈ 41.4096° |
| 4/5 | ≈ 36.8699° |
| √3/2 | 30° = π/6 |
| 0.9 | ≈ 25.8419° |
| 12/13 | ≈ 22.6199° |
| 1 | 0° = 0 |
| 2 | does not exist |
FAQ
What is arccos(0.9)?
arccos(0.9) ≈ 25.8419° ≈ 0.4510 rad
How to convert arccos(0.9) to radians?
Multiply the angle in degrees by π/180: 25.8419° × π/180 ≈ 0.4510 rad.
Why does a calculator show 0.4510 for arccos(0.9)?
The calculator is in radian mode (RAD) and gives the angle in radians: arccos(0.9) ≈ 0.4510 rad. In degrees (DEG) it is ≈ 25.8419°.
See Also
- Arccos of −0.3 (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 −4/5 (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 0 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.1 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.3 (Inverse Cosine) in Degrees and Radians
- Arccos of 0.7 (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 2/3 (Inverse Cosine) in Degrees and Radians
- Арккосинус 0.9 (arccos 0.9) в градусах и радианах
- Arcocoseno de 0.9 (arccos 0.9) en grados y radianes
- Arco cosseno de 0.9 (arccos 0.9) em graus e radianos