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The ArcTan function returns a value that specifies the arc tangent of the passed value.
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Syntax | ||||
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ArcTan(Value) | ||||
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Return value | ||||
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Type |
Description | |||
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Double |
Arc tangent of Value | |||
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Parameter | ||||
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Use |
Name |
Type |
Passing |
Description |
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Required |
Value |
Double |
ByVal |
Value to retrieve the arc tangent. |
Notes
The ArcTanfunction calculates the ratio of two sides of a right-angled triangle (Value) and returns the corresponding anglein radians. The ratio is the length of the side opposite the angle divided by the length of the side attached to the angle.
The result for the radians is in the range of - π/2 to π/2.
In order to convert degrees to radians, the degree must be multiplied by π/180.
ArcTan is the inverse function of the trigonometric function Tan, which receives an angle as an argument and returns the ratio of the two sides of a right-angled triangle. Do not confuse ArcTan with the cotangent that corresponds to the inverse of the tangent (1/tangent).
Example
Dim pi2 As Double
pi2 := 4 * ArcTan(1)
In this example, the ArcTan function is used to calculate the value of π.
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