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The distance between the two parallel li...

The distance between the two parallel lines is 1 unit. A point A is chosen to lie between the lines at a distance 'd' from one of them Triangle ABC is equilateral with B on one line and C on the other parallel line. The length of the side of the equilateral triangle is

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The correct Answer is:
`(2)/(sqrt(3))sqrt((a^(2)-a+1))` units
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