Trigonometric Ratios And Graphs
Overview
Trigonometric ratios connect angles to lengths, and their graphs reveal the repeating patterns that underpin everything from sound waves to satellite orbits. Mastering the exact values for the standard angles and knowing how sine, cosine and tangent behave beyond the first quadrant is the gateway to every other trigonometry topic in the 4PM1 specification.
In this lesson you will learn to evaluate sin, cos and tan for any angle, sketch the three core graphs from memory, recall the exact values for 30, 45 and 60 degrees (and their radian equivalents), and use symmetry to find trigonometric ratios of related angles in all four quadrants.
Objectives
- Know the three basic trigonometric ratios of angles of any magnitude in degrees or radians
- Sketch and use the graphs of sine, cosine and tangent
- Know the exact values for sine, cosine and tangent of 30, 45 and 60 degrees and their radian equivalents
- Use exact values to find the trigonometric ratios of related angles
Mind map
This topic is mapped out so you can see how the ideas connect.
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Flashcards
Quick recall practice on the facts this topic is tested on.
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Trigonometric Ratios And Graphs. 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.
- What is the exact value of sin 30 degrees? A) 1 B) 1/2 C) sqrt(3)/2 D) 1/sqrt(2) Answer: B
- In which quadrant is the angle 300 degrees? A) First B) Second C) Third D) Fourth Answer: D
- What is the period of the tangent function? A) 90 degrees B) 180 degrees C) 270 degrees D) 360 degrees Answer: B
- What is the exact value of cos 135 degrees? A) 1/sqrt(2) B) -1/sqrt(2) C) sqrt(3)/2 D) -sqrt(3)/2 Answer: B
- The graph of y = sin(theta) crosses the theta-axis at which of these points? A) 0, 90, 180 B) 0, 180, 360 C) 90, 270 D) 0, 90, 270 Answer: B
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Practice Mock Questions
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