In this section you will learn about radians and circular measure, along with the method for converting between degrees and radians. Some common values of trigonometric functions in radians are given. Graphs of the trigonometric functions are available, with the angle measured in radians. Methods for solving trigonometric functions in radians are given, along with the formulae for the length of an arc and the area of a sector of a circle, where an angle is known in radians.

• Notes and Examples
  • Proof of formulae for arc length and sector area
  • Explanation of conversions between degrees and radians
• Crucial Points

Exercises

• Exercise Sheet (Solutions)
• Multiple Choice Test (Solutions)

Interactive

• Converting from degrees to radians
• Converting from radians to degrees
• Standard values of sin, cos and tan
• Using radians to find an arc length
• Using radians to find the area of a sector
• Converting from degrees to radians
• Converting from radians to degrees