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Level 1: Construct an equilateral triangle from the line segment ABAn equilateral triangle is a triangle whose sides all have the same length:If you are heading in the right direction, the game will notice you with a "Well Done!" message. After successfully constructing the triangle, a link will appear that let you continue to level 2. Not sure what to do ? Look at the tutorial for more information how to play this game. Use Crtl+Z for undo and CrtlY for redo. You unlocked a new tool: Constructing equilateral triangles! Go to level 2. 