100% proof! the why of maths
This book is a collection of over a hundred visual and algebraic explanations and proofs of maths formulas and concepts, all needed for GCSE and A level. Set out as understandable individual pages per proof, with clear diagrams and simple algebra, all these formulas are found within one handy volume.
This book is a good revision addition, key to understanding and memory aid. Included are: Areas of rectangle, circle, triangle, parallelogram, trapezium, surface area and volume cone and sphere, ratio sides of triangle, Pythagoras, sine relationship, sine formula, sine area triangle, cosine rule, quadratic formula to find root, root relationships, circle theorems, trig identities, double angle, sums of sines, cosines, difference of two squares, completing the square, sum of geometric and arithmetic sequences and formula for circle, among others.
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