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Lesson Plans and Worksheets for Geometry

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More Lessons for Geometry

Common Core For Geometry

**Definition of Sine, Cosine, and Tangent**

Classwork

**Exercises 1–3**

- Identify the opp/hyp ratios for ∠𝐴 and ∠𝐵.
- Identify the adj/hyp ratios for ∠𝐴 and ∠𝐵.
- Describe the relationship between the ratios for ∠𝐴 and ∠𝐵.

**Exercises 4–9**

- In △ 𝑃𝑄𝑅, 𝑚∠𝑃 = 53.2° and 𝑚∠𝑄 = 36.8°. Complete the following table.
- In the triangle below, 𝑚∠𝐴 = 33.7° and 𝑚∠𝐵 = 56.3°. Complete the following table.
- In the triangle below, let 𝑒 be the measure of ∠𝐸 and 𝑑 be the measure of ∠𝐷. Complete the following table.
- In the triangle below, let 𝑥 be the measure of ∠𝑋 and 𝑦 be the measure of ∠𝑌. Complete the following table.
- Tamer did not finish completing the table below for a diagram similar to the previous problems that the teacher had on the board where 𝑝 was the measure of ∠𝑃 and 𝑞 was the measure of ∠𝑄. Use any patterns you notice from Exercises 1–4 to complete the table for Tamer.
- Explain how you were able to determine the sine, cosine, and tangent of ∠𝑄 in Exercise 8.

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