5.1.1

Radians

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Radians

A radian is another unit for measuring angles. There are 2π2\pi radians in a full circle. The radian unit can be written as rad.

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Definition of a radian

  • The angle between two radii of a circle connected by an arc length that is equal in length to the radius is equal to one radian.
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Comparison to degrees

  • There are 2π\pi radians and 360 degrees in a circle.
  • If an object travels all the way around a circle it has done one revolution.
    • 1 rad=3602π57.3o1\text{ rad}=\frac{360}{2\pi} \approx 57.3^o

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1Proof

2Algebra & Functions

2.1Powers & Roots

2.2Quadratic Equations

2.3Inequalities

2.4Polynomials

2.5Graphs

2.6Functions

2.7Transformation of Graphs

2.8Partial Fractions (A2 Only)

3Coordinate Geometry

4Sequences & Series

5Trigonometry

6Exponentials & Logarithms

7Differentiation

8Integration

9Numerical Methods

10Vectors

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