book Maths Puzzle Numerical Ability

Can you explain how to substitute cot (angle) with 1/root3

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I do not understand distributive property at all. I really need help with it but i cant seem to get it. None of my friends understand either. Please help me with it. I need to understand distributive property to pass math. Thank You The cross section of a large telescope having a diameter of 520 feet and a maximum depth of 55 feet. What is the equation of the parabola?

A){{{y=11/52)x^2}}}x^2

B){{{