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From users who are members of Transition to university :
|Christian Lawson-Perfect||said||Ready to use||5 years, 2 months ago|
|Aiden McCall||said||Needs to be tested||5 years, 2 months ago|
|Chris Graham||said||Has some problems||5 years, 2 months ago|
Christian Lawson-Perfect 5 years, 2 months ago
Saved a checkpoint:
Not massively happy with this - the centre of enlargement is always $(0,0)$ and the scale factor is always $\pm 2$.
The diagrams aren't very precisely drawn either.
I've reworded the advice so it actually gives the answers.
Chris Graham commented 5 years, 2 months ago
The diagram with rectangles of the same scale reflected across $y=-x$ are very confusing. To start with, I would avoid having the same, albeit negative, scale. Your question statement says "Describe the transformation of image A to B." From that statement, describing this transformation in terms of enlargement is a strange thing to do (rotation or reflection come to mind).
In the advice, to the naive student, the way that you describe finding the centre of enlargement - drawing lines between corresponding vertices (e.g. top left of A And top left of B) - the lines do not intersect at all.
I guess the point is that it is not clear from your diagram that B has inverted (this is only clear when you reverse engineer it, starting with the first image and applying the scale factor to each vertex). You would need to label the individual vertices on both A and B to make that clear, or just avoid this example altogether.
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This question is used in the following exams:
- Plane transformations by Christian Lawson-Perfect in Transition to university.
- Possible applicable questions from previous year by Tom Bold in Transition to university maths.
- Transition Geometry by Chris Templet in Chris's workspace.
- claire's copy of Plane transformations by claire lines in claire's workspace.
- ME0006 Wk 1 Test 2 by claire lines in claire's workspace.