 # The Definition of Sine, Cosine, and Tangent

##### This The Definition of Sine, Cosine, and Tangent lesson plan also includes:

Introduce your classes to a new world of mathematics. Pupils learn to call trigonometric ratios by their given names: sine, cosine, and tangent. They find ratios and use known ratios to discover missing sides of similar triangles.

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CCSS: Designed
##### Instructional Ideas
• Compare the trigonometric ratios of special right triangles with the known patterns; help learners to see that they can apply this concept to all right triangles
• Form collaborative groups to complete the exit ticket and possibly the practice problems
##### Classroom Considerations
• Pupils should already have a basic understanding of side ratios in right triangles
• Builds from the previous lesson in the 36 part series
##### Pros
• Lesson does not require a calculator as the focus is on similarity and equivalent ratios
• The well-designed lesson leads students through the process of applying trigonometric ratios to similar triangles
• Makes a connection to the sine and cosine of complementary angles
##### Cons
• There are inconsistencies in simplifying radicals; sometimes the denominator is rationalized and other times it is not