# Trigonometry | Maths with Lemon

Source: https://mathswithlemon.io/ai-geometry-trigonometry-Sin%20Cosine%20rules.html


#### The sine, cosine and tangent of an angle in a triangle


##### What you have to know:

- You must be able to manipulate simple algebraic expressions. (If not, check this lesson)
- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

#### The Sine Rule


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

#### The Cosine Rule


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

#### Area of a Triangle (with Trigonometry)


##### What you have to know:

- The Pythagorean Theorem.

##### Key Points

- 1. Watch the video:
- 2. Read this presentation

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