2B Trigonometric Ratios on the Unit Circle
Trigonometric ratios can be defined using the point at which the terminal arm of an angle drawn in standard position intersects the unit circle. For some angles a tidy exact value can be given for the ratio, but for most angles a decimal approximation is used.
- How is related to the unit circle? ? ?
- How do the SOH CAH TOA rules relate to the unit circle?