exam Maths Puzzle Numerical Ability

hi, i would like to know how to find the apothem of a polygon, if i only know its perimeter.
please try to help me,

thanks.

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exam Other Question

EXPRESS AS A POLYNOMIAL: x + a(x^2-ax/ x) Solve the equation for x:
x^2 + 4x + 4 = 7
(x + 2)(x + 2) = 7
(x + 2)^2 = 7
x + 2 = +/- radical 7
x = -2 +/- radical 7

Is this correct?