Calculate the area of an equilateral triangle of side x.
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yes nice problem
Most nonzero elements in row
Replace NaNs with the number that appears to its left in the row.
Back to basics 13 - Input variables
intersection of matrices
Check that number is whole number
Is this triangle right-angled?
Side of a rhombus
Area of an Isoceles Triangle
Side of an equilateral triangle
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