Statically Indeterminate Truss:

A truss is a structural framework of triangular elements connected at joints. Trusses are commonly used in bridges, roofs, and other structures to provide stability and support. When analyzing trusses, engineers classify them as either statically determinate or statically indeterminate.

1. Statically determinate truss:
A statically determinate truss is one in which the reactions at all the supports and the forces in all the members can be determined by using the equations of static equilibrium alone. In other words, all the external and internal forces can be calculated using a set of equations.

2. Statically indeterminate truss:
A statically indeterminate truss is one in which the reactions at the supports and the forces in the members cannot be determined solely by using the equations of static equilibrium. Additional information, such as the deformation of the truss or compatibility conditions, is necessary to calculate the unknown forces.

Explanation:

In the given question, the value of R is given as 4. To determine whether the truss is statically determinate or indeterminate, we need to analyze the truss and check if the equations of static equilibrium alone are sufficient to calculate all the unknown forces.

However, the given question does not provide any information about the truss itself, such as the number of members, supports, or their configurations. Without this information, it is not possible to determine the static determinacy or indeterminacy of the truss.

Therefore, without additional information about the truss, we cannot definitively determine whether it is statically determinate or indeterminate. The correct answer should be marked as "Insufficient information given."

Conclusion:

Without additional information about the truss, it is not possible to determine whether it is statically determinate or indeterminate. The answer provided in the question is incorrect, as it assumes that the truss is statically indeterminate without any basis.