The pin jointed frame as shown in following figure is:

Concepts:

Perfect frames are the one which can be analyzed using the three conditions of static equilibrium.

For these truss frames:

n= 2j – 3

Redundant frame is a frame having more number of members than required such that there is always a member in which force cannot be computed using equations of static equilibrium, we need other equation like compatibility equations to find force in redundant members. For these,

 n > 2j-3

Deficient frame is frame having less number of members than required for perfect frame. For these,

n < 2j-3

Here, n is number of members and j is number of joints.

Calculations:

No of joints, j = 6

No of members, n = 10

So,   2j-3 = 2× 6 – 3 = 9

As (n =10) > (2j-3 = 9), the given frame is redundant.