Common Greek Symbos: alpha – α, beta – β, gamma – γ, thita – θ
Negative angles and measurements in radians will not be considered at this level.
Angles are classified based on the the fraction of a complete turn about a point. Full circle is 360°.
Revolution
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Straight Angle
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Right Angle
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Acute Angle
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Obtuse Angle
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Reflex Angle
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More than one revolution will result in addition of 360° |
Pair of Angles
Angles are classified based on the the fraction of a complete turn about a point. Full circle is 360°. |
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Supplementary Angles
Two angles which add to 180° are called supplementary angles. These angles may not be adjacent angles. |
Complementary Angles
A pair of angles which add to 90° are called complementary angles. These angles may not be adjacent angles. |
Linear Pair A linear pair is a pair of adjacent angles formed when two lines intersect.
p+q=180° |
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Lines which meet at 90° are called perpendicular lines |