Flash cards
Review the key moves
What is the main idea behind Java Math atan2() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___.out.println(Math.atan2(0.5, 0.5));Put the learning moves in the order that makes the concept easiest to apply.
❮ Math Methods
Example
System.out.println(Math.atan2(0.5, 0.5));
System.out.println(Math.atan2(-0.5, -0.5));
System.out.println(Math.atan2(5, 5));
System.out.println(Math.atan2(10, 20));
System.out.println(Math.atan2(-5, -5));
System.out.println(Math.atan2(-10, 10));Definition and Usage
The atan2() method returns the angle theta in radians from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta).
This is the same as calling atan(y/x) except that it takes into account negative values of x so that it can return angles outside of the range -PI/2 to PI/2.
Note
In the atan2() method the y coordinate goes first, then the x coordinate. This is because it is doing the division y / x.
Syntax
public static double atan2(double
y , double
x )Parameter Values
| Parameter | Description |
|---|---|
| y | Required. The y coordinate of the point to find the angle of. |
| x | Required. The x coordinate of the point to find the angle of. |
Technical Details
| Returns: | A double value representing the angle in radians that a point (x, y) makes around the origin (0, 0). |
|---|---|
| Java version: | Any |