Consider a truss structure where two forces act at joints C and D, connected with frictionless joints. Determine the forces in each truss member and identify tension or compression in each truss member. The method of joints can be used to determine all forces acting at each joint. The analysis begins with joint C as it has the least unknown forces. Draw a free-body diagram of joint C. Using the equilibrium equations, the unknown forces can be determined. The angle between the members BD and AD can be determined as the tan inverse of the ratio of the length of AB and AD. Next, consider joint D and draw a free-body diagram. The joint D consists of two known and two unknown forces. Resolve the force in the member BD into its components, and by using the equation of equilibrium, the unknown forces can be determined. Members experiencing the forces pointing away from the joint are in tension, while the members experiencing forces pointing towards the joint are in compression.