Calculate the area of an equilateral triangle of side x.
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yes nice problem
Back to basics 3 - Temp Directory
Spot the outlier
Given a 4x4 matrix, swap the two middle columns
2倍してみよう - ここからスタート！
Create a vector
Side of an equilateral triangle
Find a Pythagorean triple
Length of a short side
Length of the hypotenuse
Side of a rhombus
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