Composition of transformations

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SUMMARY

The discussion focuses on the composition of two transformations: T, a rotation by 30 degrees about point 2, and S, a rotation by 45 degrees about point 4. The composition T composed with S indicates that S is performed first, followed by T. The geometric interpretation involves visualizing the rotations as movements of a body while keeping an arm stiff, illustrating how the transformations interact spatially.

PREREQUISITES
  • Understanding of geometric transformations, specifically rotations.
  • Familiarity with the concept of composition of functions in mathematics.
  • Knowledge of coordinate systems and points in a plane.
  • Basic visualization skills for geometric movements.
NEXT STEPS
  • Study the properties of rotation transformations in geometry.
  • Explore the mathematical representation of transformations using matrices.
  • Learn about the effects of composing multiple transformations in a sequence.
  • Investigate the geometric interpretation of transformations in different coordinate systems.
USEFUL FOR

Students of geometry, mathematics educators, and anyone interested in understanding the composition of geometric transformations.

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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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:
 

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