Arctan of 4/5
Arcsin, Arccos, Arctan, Arccot
What is arctan(4/5)?
Answer
arctan(4/5) ≈
38.6598° ≈ 0.6747 rad
Range: arctan x is an angle strictly between −90° and 90°, so the answer is unique.
≈ — the value is not a table one; rounded to 4 decimal places.
4/5 = 0.8.
arctan(4/5) is the angle α in (−90°, 90°) with tan α = 4/5.
tan 38.6598° ≈ 0.8000
α = arctan(4/5) ≈ 38.6598°
P ≈ (0.7809, 0.6247)
T(1, 4/5) is where line OP meets the line x = 1; highlighted: tan α = 4/5.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(4/5) | ≈ 53.1301° | ≈ 0.9273 |
| arccos(4/5) | ≈ 36.8699° | ≈ 0.6435 |
| arctan(4/5) | ≈ 38.6598° | ≈ 0.6747 |
| arccot(4/5) | ≈ 51.3402° | ≈ 0.8961 |
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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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Arctangent of nearby values
| x | arctan x |
|---|---|
| 2/3 | ≈ 33.6901° |
| 0.7 | ≈ 34.9920° |
| 3/4 | ≈ 36.8699° |
| 4/5 | ≈ 38.6598° |
| 5/6 | ≈ 39.8056° |
| 0.9 | ≈ 41.9872° |
| 1 | 45° = π/4 |