Which roof type is characterized by a curved arch shape?

• A. Gable
• B. Hip
• C. Monitor
• D. Arch

Answer: (D)

Roof shapes are identified by their defining silhouette and how they carry loads. A roof with a curved arch shape uses a smooth curve from one side to the other, spanning the width of the building. That arch curve is the signature feature, giving the roof its rounded form. The arch efficiently transfers weights along the curve to the supports, allowing wide spans with fewer internal supports. Other common forms rely on straight-line geometry: a gable roof forms a triangle at the end with two pitched sides; a hip roof slopes on all sides toward the walls; a monitor roof has a raised central section with openings and a more boxlike profile. Because the curved arch is the defining trait, this roof type is the arch.