Sine And Cosine Rules — Interactive Lesson (KS4)

Sine and Cosine Rule is a completely interactive lesson designed to teach GCSE learners how to use the sine and cosine rules to find unknown sides and angles

Learning Objectives:

• use the sine rule to find unknown sides and angles;

• use the cosine rule to find unknown sides and angles;

• explain and use the relationship between the sine and cosine of complementary angles;

• use trigonometric ratios and the Pythagorean Theorem to solve right triangles in applied problems

• combine trigonometric skills to solve problems;

• derive the formula A = 1/2 ab sin© for the area of a triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.

• prove the Laws of Sines and Cosines and use them to solve problems;

• understand and apply the Law of Sines and the Law of Cosines to find unknown measurements in right and non-right triangles.

What is in the lesson:

• 39 interactive slides;

• drag and drop activities with instant learner feedback;

• differentiated questions as well as answers

• printable worksheets

Teachers can use this lesson for whole-class teaching. It can also be used for practice and revision by learners at home.

What this lesson can be used for:

• Teacher-led question and answer session

• Skill consolidation

• Google classroom

• Revision, practice, home learning

• Flashcards and Worksheets can be printed and laminated to be used as many times as possible.

• Starter activity and/or plenary

Save 20% when you buy this  as part of the Trigonometry Bundle

Other topics in this range include but are not limited to:

• 3D Coordinates

• Arc length and sector area

• Bearings

• Circle Theorems

• Trigonometry

• Pythagoras Theorems

• Congruency and Similarities

Product License

This is a single-user license. Unlimited use for you and your students. However, you may not distribute additional copies to friends or fellow teachers.

Designed for ages 14–16 (UK Year 10–11). Aligned to the UK National Curriculum; adaptable to US state standards.