 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.

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