If you take the edge length of the equilateral triangles in this picture as the unit for length, what would be the exact size of the hole ?
Alternatively, if the area of an equilateral triangles is taken as the unit for area, what size is the hole?
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This activity is adapted from the NRICH task Square Hole with permission of the University of Cambridge. All rights reserved. Also see some related problems on NRICH.
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