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On an 11 by 11 geoboard (or an 11 by 11 dot paper lattice), find all non-congruent isosceles triangles whose axis of symmetry is neither horizontal, nor vertical, nor at a 45 degree angle from horizontal. State your solution by giving the length of the sides of the triangles you find. What techniques did you use to find the answers?[Thanks to Henri Picciotto, hot@SOE.Berkeley.Edu, for contributing this problem.]

## Winning Solution

Submitted by:Grade 11,

- Jovan Milosevic
- Daniel Kim
- Felix Chang
Burnaby South Secondary School, Burnaby, BC, Canada

## Honorable Mention

Submitted by:Grade 8,

- Jacob Taylor
Georgetown Day School, Washington, DC

AndGrade 11,

- Sean Nichols
Burnaby South Secondary School, Burnaby, BC, Canada

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