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If you take the side length of the yellow equilateral triangle as the unit for length, what would be the size of the hole ?
Alternatively, if the area of the yellow equilateral triangle is taken as the unit for area, what size is the hole then ?
The Square Hole
Age 14 to 16
Challenge Level 
If you take the side length of the yellow equilateral triangle as the unit for length, what would be the size of the hole ?
Alternatively, if the area of the yellow equilateral triangle is taken as the unit for area, what size is the hole then ?
