Trigonometry And Pythagoras' Theorem
Overview
Trigonometry connects angles to lengths, making it possible to calculate distances that are impossible to measure directly. Combined with Pythagoras' theorem, it forms the backbone of geometry questions across both Edexcel papers.
You will master Pythagoras' theorem for right-angled triangles, use sine, cosine and tangent ratios to find unknown sides and angles, and at Higher tier extend these ideas to any triangle using the sine rule, cosine rule and the area formula.
Objectives
- Know, understand and use Pythagoras' theorem in two dimensions
- Know, understand and use sine, cosine and tangent of acute angles to determine lengths and angles of a right-angled triangle
- Apply trigonometrical methods to solve problems in two dimensions
- [Higher] Understand and use sine, cosine and tangent of obtuse angles
- [Higher] Understand and use angles of elevation and depression
- [Higher] Understand and use the sine and cosine rules for any triangle
- [Higher] Use Pythagoras' theorem in three dimensions
- [Higher] Understand and use the formula 1/2 ab sin C for the area of a triangle
- [Higher] Apply trigonometrical methods to solve problems in three dimensions, including finding the angle between a line and a plane
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Trigonometry And Pythagoras' Theorem. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- A right-angled triangle has sides 6 and 8. The hypotenuse is: A) 14 B) 10 C) 12 D) 100 Answer: B
- sin 30 degrees equals: A) 0 B) 0.5 C) 0.866 D) 1 Answer: B
- Which rule would you use to find a side when you know two sides and the included angle in a non-right triangle? A) Sine rule B) Cosine rule C) Pythagoras D) SOH CAH TOA Answer: B
- In a right-angled triangle, tan x = opposite / ? A) Hypotenuse B) Opposite C) Adjacent D) Diagonal Answer: C
- The area of a triangle with sides 5 cm and 8 cm and included angle 90 degrees is: A) 13 B) 20 C) 40 D) 6.5 Answer: B
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Practice Mock Questions
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