Hey i was hopeing you guys could give me some help with my maths work, im really tired and i still have 8 pages more of back to back work and iv forgoten how to calculate the absolute errors, relativ error and percentage error of this question, if you could help me out it would be great

squareroot 20 = 4.5 Find the absolute , relative and percentage errors if 4.5 is use as an aproximation to squareroot 20

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The way I was taught:

abs error = inferred - true

rel error = (inferred - true)/true

% error = 100*(rel error)

Hope this helps