Transformations
Overview
Every animated logo, every character walking across a game screen and every CAD drawing rotated on an engineer's monitor relies on the same four moves: reflect, rotate, translate, enlarge. Each one changes a shape's position or size in a precisely defined way, and each one can be described completely, without a picture, using nothing more than a few coordinates and numbers.
This topic builds fluency in all four transformations, including enlargements with negative and fractional scale factors, shows how two transformations combine into one, and introduces the 2x2 matrix as a compact way of carrying out (and identifying) a transformation algebraically.
Objectives
- Understand and use transformations of the plane including reflections in any line, rotations about any point, translations and enlargements
- Find and use combination of transformations
- Multiply a vector by a matrix to find the matrix for a given transformation of the plane
Mind map
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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 Transformations. 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.
- Which transformation does NOT preserve the size of a shape? A) Reflection B) Rotation C) Translation D) Enlargement Answer: D
- A point (4, -1) is rotated 180 degrees about the origin. What is its image? A) (4, 1) B) (-4, 1) C) (-4, -1) D) (1, -4) Answer: B
- Which of these fully describes a translation? A) The distance moved only B) The column vector C) The angle and direction D) The scale factor and centre Answer: B
- An enlargement has scale factor -3. Compared with the object, the image is: A) 3 times the size, same side of the centre B) 3 times the size, opposite side of the centre C) 1/3 the size, same side of the centre D) the same size, rotated 180 degrees Answer: B
- What single transformation does the matrix (1 0; 0 -1) represent? A) Reflection in the y-axis B) Reflection in the x-axis C) Rotation of 180 degrees about the origin D) Enlargement, scale factor -1 Answer: B
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Recommended Books
Practice Mock Questions
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