Why the pythagoras theorem is used in the second equation?

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Atran
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Hi,

I know that,

E1 = E0 + EK, and
E2 = (mc2)2 + (pc)2 = E02 + EK2, but
E0 + EK ≠ (E02 + EK2)1/2

Is one of them wrong?
Why the pythagoras theorem is used in the second equation?

Thanks.
 
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Atran said:
Hi,

I know that,

E = E0 + EK, and
E2 = (mc2)2 + (pc)2
Correct

Atran said:
... = E02 + EK2
Incorrect

E2 = E02 + 2 E0EK + EK2
 

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