Chris Graham- Numbas at mathcentre.ac.uk

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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Chris Graham on Algebra vocabulary 8 years, 5 months ago

Gave some feedback: Ready to use

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Chris Graham commented on Algebra vocabulary 8 years, 5 months ago

Corrected a couple of typos and have formatted the table so that it is left aligned.

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Chris Graham on Transformation - Translation 8 years, 5 months ago

Gave some feedback: Has some problems

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