If an equilateral triangle has area A, then what is the length of each of its sides, x?
Image courtesy of Wikipedia.
Definitely helpful if you draw a picture first.
Find relatively common elements in matrix rows
Project Euler: Problem 6, Natural numbers, squares and sums.
Deleting an element in a matrix
Area of an Isoceles Triangle
Is this triangle right-angled?
Area of an equilateral triangle
Find a Pythagorean triple
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