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The simplest way is to construct a square which has two pairs of equal opposite parallel lines
An equal sign IS two lines. Whatever mathemetician first invented the symbol apparently thought it was the best symbol to show equality (equal-ness).
They are straight lines. The sum of the squares of the lengths of the two shorter sides is equal to the square of the length of the longest side. But subject to that constraint, the sides can have any lengths.They are straight lines. The sum of the squares of the lengths of the two shorter sides is equal to the square of the length of the longest side. But subject to that constraint, the sides can have any lengths.They are straight lines. The sum of the squares of the lengths of the two shorter sides is equal to the square of the length of the longest side. But subject to that constraint, the sides can have any lengths.They are straight lines. The sum of the squares of the lengths of the two shorter sides is equal to the square of the length of the longest side. But subject to that constraint, the sides can have any lengths.
Draw two lines of equal length meeting at a vertex. Make sure that the angle between the lines is not 90 degrees. At the far end of each of these lines, draw a line, again equal in length, at an angle that is supplementary to the first angle.[Two angles are supplementary if their sum is 180 degrees.]
A Kite : This is a quadrilateral having two pairs of adjacent sides equal in length.