I just wanted to let people know that if you are looking for video lessons for maths, you can find some by following the link in my signature. If you have special request on a particular question don't hesitate to drop me a line and ill make a video for you.
Hope that helps and get revising
Well it seems that a lot of people don't seem to understand which side is which and hence getting confused. when i teach my students, i enphasize on labelling the sides properly before attempting a question. So whenever you have a right angle triangle and you are missing a side, say to yourself that you are going to use pythagoras.
Pythagoras theorem is a^2+b^2=c^2
get into the habit of labeling the shortest side a, the longest side c and the medium side b. Once you have labelled them, you should be able to see which side you need to work out. depending on that use the following formulae
if you are missing a then use:
if you are missing b then use:
and if you are missing c then use
c^2 = a^+b^2
now its just a matter of picking the right formula and changing the letters with the corresponding numbers and squaring them appropriately. Hope that helps