acosd

 
 
 

Returns the degree value of the arc cosine of a number. The arc cosine is the angle whose cosine is the specified number. The returned value is from 0 to 180.

float acosd(float number)

number is the cosine of the angle, and must be from -1 to 1.

Example

acosd(1)

Returns 0 degrees.

acosd(-0.5)

Returns 120 degrees.