Problem 11 · 2019 Math Kangaroo
Medium
Spatial & Visual Reasoning
sequence-of-figuresspatial-reasoning
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Answer: A
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Hint 1 of 3
The yardstick is one chain of 10 equal pieces joined end to end, so every shape uses all 10 segments.
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Hint 2 of 3
Walk along each outline and count how many equal segments it is made of.
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Hint 3 of 3
The shape she cannot make is the one whose segment count is not 10.
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Approach: count edges; the path must use exactly 10 pieces
- The yardstick is one connected chain of 10 equal pieces, so any shape she folds must be drawn with exactly 10 equal segments.
- Trace each picture and count its segments: four of them come out to 10 segments and can be made.
- Figure A needs a number of segments other than 10, so she cannot make it (A).
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