A frame or truss is said to be perfect, if it satisfies the equation where 'n' is the members and 'j' is the number of joints in the frame
An = (3-2j)
Bn =(2j-3)
Cn = (2j-1)
Dn =(j - 3)
An = (3-2j)
Bn =(2j-3)
Cn = (2j-1)
Dn =(j - 3)
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