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 simultaneous equations?


Triangle ABC has perimeter 20 cm. AB = 7 cm. BC = 4 cm. By calculation, deduce whether triangle ABC is a right-angled triangle. 4 marks.


Factorise this quadratic = 8x^2 + 2x -3


Factorise fully X^2 - 6X + 8