What do you call structural members that are exactly opposite of one another?

What do you call structural members that are exactly opposite of one another?

• A. Rights and Lefts
• B. Fronts and Backs
• C. Top and Bottom
• D. Inwards and Outwards

Answer: (A)

The key idea is identifying a pair of members that sit on opposite sides of a structure, mirrored around the centerline. In this context, those opposing members are described by their position: the right side and the left side. Saying “rights and lefts” communicates that there are two corresponding parts on opposite sides, which is exactly how symmetrical frames are labeled to ensure correct assembly and balance.

Fronts and Backs describe front-to-back orientation, not left-right symmetry. Top and Bottom refer to vertical orientation, not opposite sides. Inwards and Outwards describe direction toward or away from the center, rather than the specific left-right pairing.