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|dw:1359053220511:dw|
Use the Pythagoras Theorem.

Does anyone know the answer?

is it 13?

|dw:1359054324212:dw|

it was 5

Sorry, I just noticed that I wrote down the wrong point. I'll do it again.

Its fine,

do you know this one

|dw:1359054497622:dw|

x^2 = 3^2 + 4^2
x^2 = 9 + 16
x^2 = 25
x = sqrt(25)
x = 5

^^