About Angles
Angles measure rotation or the space between two lines meeting at a point. Degrees are the most common everyday unit; radians are standard in mathematics and physics.
Gradians (grad) are used in surveying — a full circle is 400 grad, making right angles an exact 100 grad.
Pro Tips
To convert degrees to radians, multiply by π/180 ≈ 0.01745. For radians to degrees, multiply by 180/π ≈ 57.296.
Most programming languages (Math.sin, Math.cos) use radians, not degrees — always convert before use.