Arc base pin curls are categorized as which base curl shape?

• A. Arc base curls
• B. Half-moon curls
• C. U-shaped base curls
• D. C-shaped base curls

Answer: (D)

Base curl shape describes how the hair curves at the base of a pin curl. An arc base pin curl uses a curved segment of a circle at the base, and the resulting curl forms a smooth, open curve that resembles the letter C. So arc base pin curls are categorized as C-shaped base curls. A half-moon base would create a crescent-shaped curvature, a U-shaped base would give a broader, horseshoe-like curve, and those shapes don’t match the arc-based setup.