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©G Dear2008 – Not to be sold/Free to use Mathematic (HSC) Geometry Revision Stage 6 - Year 12 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use

Types of Angles 1. Acute angles 2. Right Angle 3. Obtuse Angle (0o < θ < 90o θ = 90o (90o < θ < 180o) 4. Straight Angle 5. Reflex Angle (θ = 180o) 6. Angle of Revolution (180o < θ < 360o) (θ = 360o)

Pairs of Angles 1. Vertically Opposite Angle are equal. ao bo 2. Complementary Angles add to 90o. ao bo 2. Supplementary Angles add to 180o.

Angles between Parallel Lines Transversal 1. Alternate Angles 3. Co-Interior angles 2. Corresponding Angles Makes a Z shape. Makes a C shape. and are equal. Makes a F shape. and Add to 180o and are equal.