How do I know whether to add or minus in Pythagoras's theorem?
Firstly it has to be a right angled trinagle. Even if it is an irregukar shape, draw a line in to make it a right angled triangle. When you have your right angled triangle remember it is ALWAYS + if it is the hypotenuse (longest side) and - if it is not the hypotenuse.
NM
Related Maths GCSE answers
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What is compound interest?
Factorise and solve x^2 - 8x + 15 = 0
a.) simplify and expand (x+3)(2x+5) b.) differentiate (x+3)(2x+5) c.) where does this function intercept the x and y axis? d.) does this function have any turning points? if so where?