A rigid-jointed plane frame is stable and statically determinate if (where m is

Question

A rigid-jointed plane frame is stable and statically determinate if (where m is number of members, r is reaction components and j is number of joints)

Options:

A . (m + r) = 2j

B . (m + r) = 3j

C . (3m + r) = 3j

D . (m + 3r) = 3j

Answer: Option C

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