L4.6 - Working with Trigonometric Ratios

Learning Intentions and Success Criteria

We are learning to:

Calculate side lengths in right triangles using cosine, sine, and tangent (using words and other representations)

We are successful when we can:

Estimate the value of z.

1. Use your calculator to determine the values of cos(50), sin(50), and tan(50).

2. Use your calculator to determine the values of cos(40), sin(40), and tan(40).

3. How do these values compare to your chart?

4. Find the value of z.

1. Solve for x.

2. Solve for y.

3. Find all the missing sides and angle measures.

a. The measure of angle X is 90 degrees and angle Y is 12 degrees. Side XY has length 2 cm.

c. The measure of angle K is 90 degrees and angle L is 71 degrees. Side LM has length 20 cm.

We are learning to:

Calculate side lengths in right triangles using cosine, sine, and tangent (using words and other representations)

We are successful when we can:

Side KL

Side LM

Angle L