book Maths Puzzle Numerical Ability

A Regualr polygon of n sides inscribed in a circle of radius r has 3r squared. What is the value of n?

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book Other Question

This is my question.
The product of two consecutive even integers is 56. Find the two integers.
I got this far
x(x+2)= 56
x^+2x= 56
x^+2x-56 = 0
(x-?)(x+?)= 0
thanks thirty-two more than a number is 75