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2015 Math Kangaroo

Problem 7

Problem 7 · 2015 Math Kangaroo Medium
Spatial & Visual Reasoning shadows-projectionsspatial-reasoning

What do you see if you look at the tower, which is made up of two building blocks, exactly from above? (The tower and the five answer pictures are shown in the figure.)

Figure for Math Kangaroo 2015 Problem 7
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Answer: A
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Hint 1 of 2
Looking straight down, you only see the outline of the widest part of the tower.
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Hint 2 of 2
Both round blocks in the tower look round when you peek at them from straight above.
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Approach: find the shape of the top-down outline
  1. Pretend you are a bird flying right over the tower and looking straight down.
  2. Both round blocks make a round outline, so from above you see a circle.
  3. That is choice A.
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