How do I remember the area of a circle if it's not in the formula book?

I tend to use rhymes to remember difficult maths formulas - it makes life so much easier! For example, "I never knew how much I cared that the area of a circle is πr²". 

MP

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How do i solve quadratic equations?


Expand and simplify the following equation: 3(2a+2) + 4(b+4)


Make y the subject of the formula p=((x+y)/5)^(1/2)


find the roots of this following equation: 2x^2+18x+36