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# cant tell the difference between trigonometry and pythagoras theorem! help! watch

1. Hi! Okay i know this is going to sound stupid but i know how to do trigonometry and pythagoras theorem but when it gets put in the question i can never remember which is which, so my question is does anyone have a way that i could try to remember how to tell them apart? Thank you!
2. (Original post by Autumndream)
Hi! Okay i know this is going to sound stupid but i know how to do trigonometry and pythagoras theorem but when it gets put in the question i can never remember which is which, so my question is does anyone have a way that i could try to remember how to tell them apart? Thank you!
pythagoras is purely for finding ANOTHER SIDE in a right angled triangle. Trigonometry (sin cos and tan in the sohcahtoa rule) is if you want to find either the angle or a side of a right angled triangle. Look at the question and what you are given. If you are given an angle and a side, it's trig. If you are given 2 sides then it's pythagoras. The question should make it clear
3. (Original post by Autumndream)
Hi! Okay i know this is going to sound stupid but i know how to do trigonometry and pythagoras theorem but when it gets put in the question i can never remember which is which, so my question is does anyone have a way that i could try to remember how to tell them apart? Thank you!
http://catman3000.hubpages.com/hub/P...our-math-exams

4. Thank you!!!
5. (Original post by Autumndream)
...
If you know the lengths of two sides in a right angled triangle and want to know the length of the third side it's Pythagoras.
6. Thank you

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