Question

what is true about planar trusses?
□ the members are joined at end points only.
☑ in a planar truss all of its members lie in the same plane.
☑ planar trusses are often used in the construction of roofs and bridges.
□ plannar trusses are excellent for climbing.

Explanation:

• For "The members are joined at end points only": In planar trusses, members are connected at joints (end - points), so this is true.
• For "In a planar truss all of its members lie in the same plane": By definition, planar trusses have all members in a single plane, so this is true.
• For "Planar trusses are often used in the construction of roofs and bridges": Planar trusses are commonly used in roof and bridge construction for load - bearing, so this is true.
• For "Plannar trusses are excellent for climbing": Planar trusses are structural elements for load - bearing, not designed for climbing, so this is false.

Answer:

• The members are joined at end points only. (True)
• In a planar truss all of its members lie in the same plane. (True)
• Planar trusses are often used in the construction of roofs and bridges. (True)
• Plannar trusses are excellent for climbing. (False)