Before revision: If a system is made up of bars, pin joints and support reactions, then it cannot be statically determinate if the following relationship does not hold: It should be noted that even if this relationship does hold, a structure can be arranged in such a way as to be statically indeterminate.
After revision: If a system is made up of bars, pin joints and support reactions, then it cannot be statically determinate if the following relationship does not hold: Even if this relationship does hold, a structure can be arranged in such a way as to be statically indeterminate.