Composition of transformations

In summary, T composed with S is a transformation that involves rotating by 30 degrees around point 2, and then rotating by 45 degrees around point 4. Geometrically, this can be visualized as rotating your arm (representing a shape) 30 degrees around a fixed point 2, and then rotating your whole body (with the shape still attached to your arm) 45 degrees around a fixed point 4. The result is a new position and orientation for the shape.
  • #1
fk378
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Homework Statement


Suppose T is a rotation by 30 degrees about the point 2, and S is a rotation by 45 degrees about the point 4. What is T composed with S? Can you describe this transformation geometrically?


Homework Equations


none


The Attempt at a Solution


I know T composed with S means S is the first transformation we want to do, and T is second. But I'm not sure how we can rotate about the point 4, and then rotate about the point 2.
 
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  • #2
Hi fk378! :wink:

Hold your hand out, and put in on a table … that's point 2.

Now rotate your whole body (keeping your arm stiff) 30º about point 2.

Let your feet now be at point 4.

Rotate your whole body (keeping your arm stiff) 45º about point 4.

What's the result? :smile:
 

1. What is the definition of composition of transformations?

Composition of transformations refers to the process of combining multiple geometric transformations, such as translations, rotations, reflections, and dilations, to create a new transformation that is equivalent to the individual transformations applied in sequence.

2. How is composition of transformations different from single transformations?

Single transformations only involve one transformation applied to an object, while composition of transformations involves multiple transformations applied in sequence. This results in a more complex transformation that combines the effects of each individual transformation.

3. What is the order of operations for composition of transformations?

The order of operations for composition of transformations is important as it determines the final result. Generally, transformations are applied from right to left, meaning the last transformation listed is applied first, followed by the second to last, and so on. This is known as the right-to-left convention.

4. Can any combination of transformations be composed?

No, not all combinations of transformations can be composed. Certain transformations, such as reflections and rotations, do not commute, meaning the order in which they are applied affects the final result. For example, a reflection followed by a rotation will result in a different transformation than a rotation followed by a reflection.

5. How is composition of transformations useful in real-world applications?

Composition of transformations has numerous real-world applications, such as in computer graphics and animation, where multiple transformations are combined to create complex movements and effects. It is also used in engineering and architecture to manipulate and transform objects in 3D space. Additionally, it is a fundamental concept in geometry and is used to prove theorems and solve problems involving geometric figures.

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