Lesson Plan

Using sine, Cosine and Tangent of a right triangle

Finding the unknown sides and angles of a triangle using sine, cosine and tangent
Brenda G.
Classroom teacher
Graphic Communication H S. NYC
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My Grades 9, 10, 11, 12
My Subjects Math

Students will be able to...1. apply the different formula of sine, cosine and tangent

                                     2. solve the unknown sides of a triangle using sine, cosine and tangent.

                                     3. solve problems involving angle of depression and angle of elevation

Grades 9 – 10
All Notes
Teacher Notes
Student Notes

1 Solving problems using sine, cosine, and tangent

1. using the formulas of sine, cosine  tangent giving some models and examples.

2. using hand on activities

3. using you tube video

4. giving some worksheets involving sine, cosine and tangent problems


1. In the right triangle ,angle A is 30 degrees , the opposite side measures 15 feet, find the hypotenuse of the triangle. 

2.The base of the boat has an angle of 25 degrees. The distance of the boat and the post is 300 feet, what is the height of the post.