Pi, Radians, and Trigonometric Functions

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Pi

Definition

Circumference: The perimeter of a circle

Pi: The ratio of a circle's circumference to its diameter

• The circumference of a circle with a diameter of 1 is 3.14 (1π)

Notation

• p

Circumference of a Circle

• 2πr
  • In this equation, r is the radius.

Radians

Definition

• Other units of angle measurement

• Can be written using θ

• The angle can be calculated using the following two formulas

  

• Unity provides two methods for this purpose

  • Mathf.Rad2Deg
  • Mathf.Deg2Rad

Trigonometric Functions

Definition

• Expressing the size of angles in a triangle using trigonometric ratios

• sin, cos, tan are trigonometric functions

• The values of sin, cos, and tan for each angle are as follows

  

• In addition, the values of the sine, cosine, and tangent can be calculated using the lengths of the sides

  

• In contrast, there are also inverse trigonometric functions

  

  
  
  

References

• YouTube - Math Games for Math-Phobes #05 - Pi (π)! What on Earth Does 3.14 Mean?!
• YouTube - Math Games for Math Phobes #06 - Radians: What on Earth Are These?