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2014 Math Kangaroo

Problem 7

Problem 7 · 2014 Math Kangaroo Easy
Spatial & Visual Reasoning reflectionsymmetry

Mr Hofer drew a picture of flowers on the inside of a shop window (the large picture). What do these flowers look like when you walk outside and look at the picture through the glass? (Choose the matching picture.)

Figure for Math Kangaroo 2014 Problem 7
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Answer: E
Show hints
Hint 1 of 3
Looking through the glass from the other side is just like looking in a mirror.
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Hint 2 of 3
A mirror swaps left and right, but keeps top and bottom the same.
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Hint 3 of 3
Hold the picture up to a mirror in your mind: what is on the left jumps to the right.
Show solution
Approach: flip the picture left-to-right like a mirror
  1. Seeing the drawing from outside the glass is the same as seeing it in a mirror.
  2. A mirror keeps each flower the right way up but swaps the left side with the right side.
  3. So flowers on the left of the drawing should now be on the right.
  4. The picture flipped left-to-right is E.
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