Problem 12 · 2018 Math Kangaroo
Medium
Spatial & Visual Reasoning
reflectiontransformations
The two colours of this picture are swapped. Then the picture is turned. Which of the pictures below is obtained?
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Answer: E
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Hint 1 of 2
Do it in two steps: first make every black part white and every white part black, then turn the whole picture.
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Hint 2 of 2
Pick one easy-to-spot part, swap its colour, and follow where it goes when the picture is turned.
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Approach: swap the two colours first, then turn the picture, following one landmark part
- Swap the colours: everything that was black becomes white and everything white becomes black.
- Now turn that swapped picture and follow one easy landmark to see where it ends up.
- The picture that matches after both steps is E.
Mark:
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