# Use cosine ratio to calculate angles and sides (Cos = a / h)

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##### Intros

##### Examples

###### Lessons

- Determine each cosine ratio using a calculator

- $\cos 50^\circ$
- $\cos-50^\circ$

- Determine the angle to the nearest degree using a calculator

- $\cos \theta = 0.24$
- $\cos \theta = -0.45$

- Determine the angles and sides using cosine
- Draw and label a right triangle to illustrate Cosine ratio, then calculate the angle.