Arccos of 0.55
Arcsin, Arccos, Arctan, Arccot
What is arccos(0.55)?
Answer
arccos(0.55) ≈
56.6330° ≈ 0.9884 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(0.55) is the angle α in [0°, 180°] with cos α = 0.55.
cos 56.6330° ≈ 0.5500
α = arccos(0.55) ≈ 56.6330°
P ≈ (0.55, 0.8352)
P lies on the line x = 0.55 in the upper half of the circle, where sin α ≥ 0; highlighted: cos α = 0.55.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(0.55) | ≈ 33.3670° | ≈ 0.5824 |
| arccos(0.55) | ≈ 56.6330° | ≈ 0.9884 |
| arctan(0.55) | ≈ 28.8108° | ≈ 0.5028 |
| arccot(0.55) | ≈ 61.1892° | ≈ 1.0680 |
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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
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<a href="https://calculat.io/en/number/inverse-trigonometry/arccos--0.55">Arccos of 0.55 (Inverse Cosine) in Degrees and Radians</a>Facebook
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![Arccos of 0.55 (Inverse Cosine) in Degrees and Radians. arccos(0.55) ≈ 56.6330° ≈ 0.9884 rad: the angle in [0°, 180°] whose cosine is 0.55. With the check and the unit circle.](https://calculat.io/en/number/inverse-trigonometry/arccos--0.55/generated.jpg)
Arccosine of nearby values
| x | arccos x |
|---|---|
| 1/3 | ≈ 70.5288° |
| 2/5 | ≈ 66.4218° |
| 1/2 | 60° = π/3 |
| 0.55 | ≈ 56.6330° |
| 4/7 | ≈ 55.1501° |
| √3/3 | ≈ 54.7356° |
| 3/5 | ≈ 53.1301° |