Problem 20 · 2019 Math Kangaroo
Stretch
Spatial & Visual Reasoning
reflectionspatial-reasoning
Six paper strips are used to weave a pattern (see diagram). What do you see when you look at the pattern from behind?
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Answer: C
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Hint 1 of 2
Looking from behind flips the pattern left-to-right like a mirror.
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Hint 2 of 2
At every crossing, the strip that was on top from the front is underneath from the back.
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Approach: mirror the weave
- Viewing from behind reflects the whole pattern horizontally.
- It also swaps over and under at each crossing.
- Applying both changes to the woven pattern gives option C.
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