## Sine, Cosine and Tangent (Trigonometry Four quadrants)

The 6 trigonometric functions when graphed in an x-y coordinate plane, give different measurements based on their side and angle. The sign of the trigonometric functions depends on how the angle is formed.

**Quadrantal**** angle: **The angle made when the terminal side is on the x-axis or y-axis.

The quadrantal angles in degrees are 0°, 90°, 180°, 270°.

The same quadrantal angles in radians are 0, π/2, π, 3π/2.

**Example:** In which quadrant do the following angles come under : trigonometry four quadrants

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