Trigonometry Study Guide
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Last updated 2:16 AM on 2/4/26
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9 Terms
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Sine Values for Common Angles
Sin0° = sqrt0/2 = 0
Sin30° = sqrt1/2 = ½
Sin45° = sqrt2/2 = sqrt2/2
Sin60° = sqrt3/2 = sqrt3/2
Sin90° = sqrt4/2 = 1
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Cosine Values for Common Angles
Cos0° = sqrt4/1 = 1
Cos30° = sqrt3/2 = sqrt3/2
Cos45° = sqrt2/2 = sqrt2/2
Cos60° = sqrt½ = ½
Cos90° = sqrt0/2 = 0
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Angles of Elevation and Depression are only measured via
A horizontal line
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If θ is an angle or a real number then you should use
The Pythagoran Identity (sin²θ+cos²θ)= 1
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Quadrant I is
-2π or 360°
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Quadrant II is
π - θ or 180° - θ°
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Quadrant III is
θ - π or θ - 180°
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Quadrant IV
2π - θ or 360 - °θ
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Reference Angles
0°, 30°, 45°, 60°, 90° ←→0, π/6, π/4, π/3, π/2
Note 
Flashcards (34)