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
All answers ▸Simplify (2^2)^3
The first 4 terms of a different sequence are: 9, 13, 17, 21. Find an expression for the nth term of the sequence
John wants to invest £100 into a savings account for 15 years. If he invests in saving account A he will receive 3.5% simple interest and if he invests in savings account B he will receive 3% compound interest. Which account should he choose and why?
John and simon share £80 in the ratio 5:3 in that order, how much do they each receive?