Now that you're diving into KS3 Maths, you've encountered loads of formulae. They help us figure out areas, volumes, scientific stuff, and much more. Algebra comes in handy if we need to re-arrange formulae - so don't say algebra is useless!
What exactly is a formula? It's like a pair of maths expressions joined by an equals sign. Usually, we remember them in one setup, like the area formula for a circle: area = πr^{2}. Easy if you know 'r', but what if you're given the area and need to find 'r'? You have to rearrange the formula. Do you know how?
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