Structural Analysis
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)

(3m + r) = 3j
(m + r) = 3j
(m + r) = 2j
(m + 3r) = 3j

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Structural Analysis
The minimum horizontal distance between two parallel main reinforcing bars, is

5 mm more than nominal maximum size of the coarse aggregate
Greatest value of the above
The diameter of the longer bar if their diameters are unequal
The diameter of the bar if their diameters are same

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