🦘 Math Kangaroo Grade All Felix 1-2 Ecolier 3-4 Benjamin 5-6 Kadett 7-8 Junior 9-10 Student 11-12 ⇄ switch contest
2022 Math Kangaroo

Problem 1

Problem 1 · 2022 Math Kangaroo Easy
Spatial & Visual Reasoning sequence-of-figures

Six points are placed and numbered as shown on the right. Two triangles are drawn: one by connecting the even-numbered points, and one by connecting the odd-numbered points. Which of the following shapes is the result?

Figure for Math Kangaroo 2022 Problem 1
Show answer
Answer: E
Show hints
Hint 1 of 2
Mark which of the six points are odd (1,3,5) and which are even (2,4,6), then picture the two triangles they make.
Still stuck? Show hint 2 →
Hint 2 of 2
Each triangle is fixed by its three points; overlay them and compare the combined outline to each option.
Show solution
Approach: connect the odd and even points and match the overlaid figure
  1. The odd points 1,3,5 form one triangle and the even points 2,4,6 form another.
  2. Drawing both on the given point positions, the two triangles cross each other in a particular way.
  3. Comparing that overlap with the choices, only E reproduces it.
  4. So the result is E.
Mark: · log in to save