1.

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)

A. (m + r) = 2j
B. (m + r) = 3j
C. (3m + r) = 3j
D. (m + 3r) = 3j
Answer» D. (m + 3r) = 3j


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