# Use tangent ratio to calculate angles and sides (Tan = o / a)

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##### Intros
###### Lessons
1. What are sine, cosine and tangent?
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##### Examples
###### Lessons
1. Determine each tangent ratio using a calculator
i) $\tan 70^\circ$
ii) $\tan-134^\circ$
1. Determine the angle to the nearest degree using a a calculator
i) $\tan \theta = 0.64$
ii) $\tan \theta = -1.45$
1. Determine the angles and sides using Tangent
1. Find angle A and B:

2. Find the value of "x" using tangent

3. Find the value of "x" using tangent

2. Draw and label a right triangle to illustrate tangent ratio, then calculate the angle.
1. $\tan \theta = {5 \over 9}$
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###### Topic Notes
Tangent ratio is yet another trigonometric ratio for right-angled triangles. Tangent ratio is the ratio of opposite side to adjacent side of a right triangle. Same as the sine and cosine ratios, tangent ratios can be used to calculate the angles and sides of right angle triangles.