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Atn Function
This standard VB function returns the angle (in radians) for the arctangent of the specified number. Syntax
Atn(number)
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number |
Any valid numeric expression |
Returns
The arctangent of number. Usage
The Atn function assumes number is the ratio of two sides of a right triangle: the side opposite the angle to find and the side adjacent to the angle. The function returns a single-precision value for a ratio expressed as an integer, a currency, or a single-precision numeric expression. The return value is a double-precision value for a long, variant, or double-precision numeric expression. To convert radians to degrees, multiply by (180/PI). The value of PI is approximately 3.14159. Example
This example finds the roof angle necessary for a house with an attic ceiling of 8 feet (at the roof peak) and a 16-foot span from the outside wall to the center of the house. The Atn function returns the angle in radians; it is multiplied by 180/PI to convert it to degrees. Sub Button_Click Dim height As Single, span As Single, angle As Single Dim PI As Single PI = 3.14159 height = 8 span = 16 angle = Atn(height/span) * (180/PI) End Sub
Related Topics
Cos Function Sin Function Tan Function Derived Trigonometric Functions for Siebel VB
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