How do you calculate the length of the long side of a triangle?

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Emily Stanford, English student

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If it's a right triangles, you can use Pythagoras' Theorem, but you need to know the two other side. If it's a normal triangles, if you don't have the length of the other sides and perimeter of the triangles, it will be harder.

Alister Doyle, Math makes my head hurt.

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You will need to use Pythagoras' Theorem. Here is a great video which should be able to help you out!

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