pls help me to explain this statement in c++

Question

if (base < 0 || height < 0)

 if (radius < 0)

Answer 1

it says, if the base is less than 0 OR if the height is less than 0

and the next one says, if the radius is less than 0

but, base or height or radius has no value less than 0 because there is no measurement in negative. so, these statements are incorrect and will give no output or show errors.

thanks