It's not a case of usage, but a case of comparison.
E = mc^(2)
&
K.E. = mv^(2)
E = Energy ; K.E. Kinetic Energy
m = mass
c = speed of light in a vacuum ' v = velocity (speed) of the object.
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actaully it does not equal its self i dont wanna figure it out but i have and it equals it's self : Antonio
you use A squared plus B squared equals C squared
C equals the square root of 1000 or 31.622776601683793319988935444327...
c in E=mc squared meaqns the speed of light
They all equal each other. a = b = c = d = e e = a e = b e = c e = d e = e
Well pythagorus theoreum is a squared plus b squared equals c squared and circumference equals pie x diameter and area equals pie x radius squared