Problem 5 · 2020 Math Kangaroo
Easy
Spatial & Visual Reasoning
reflectiontransformations
Flipping a card over its top edge, we see the photo of the kangaroo shown. If instead we flip the card over its right edge, what will appear?
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Answer: D
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Hint 1 of 2
Flipping over the right edge is a mirror across a vertical line, not the same as flipping over the top.
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Hint 2 of 2
A right-edge flip mirrors the picture left-to-right; work out that orientation.
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Approach: apply a flip about the right edge (a horizontal mirror)
- Flipping the card over its top edge gives the shown kangaroo, a flip about a horizontal line.
- Flipping instead over the right edge is a flip about a vertical line, the left-to-right mirror of the original.
- Carrying out that vertical flip on the starting picture gives the kangaroo in option D.
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