# Geo.4 Right Triangle Trigonometry

### Lesson 1

- I can explain why knowing one acute angle in a right triangle determines the ratio of the side lengths.

### Lesson 2

- I can determine the side lengths of triangles with 45, 45, and 90 degree angles.

### Lesson 3

- I can determine the side lengths of triangles with 30, 60, and 90 degree angles.

### Lesson 4

- I can build a table of ratios of side lengths of right triangles.

### Lesson 5

- I can use a table of ratios of side lengths of right triangles to estimate unknown angle measures.
- I can use a table of ratios of side lengths of right triangles to estimate unknown side lengths.

### Lesson 6

- I can use cosine, sine, and tangent to find side lengths of right triangles.

### Lesson 7

- I can use cosine, sine, and tangent to find the height of an object.

### Lesson 8

- I can explain why $\sin(\theta)=\cos(90-\theta)$.

### Lesson 9

- I can use arccosine, arcsine, and arctangent to find angle measures in right triangles.

### Lesson 10

- I can use trigonometry to solve problems.

### Lesson 11

- I can explain how to use regular polygons to approximate the value of $\pi$.