Arc base pin curls are also known as half-moon or _____ base curls.

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

Answer: (C)

Arc base pin curls rely on a curved base that sits against the scalp, creating a smooth, crescent-shaped curl. That crescent geometry is why this style is described as a half-moon base—the arc resembles a crescent. It’s also called C-shaped base curls because the curve looks like the letter C. This differs from a U-shaped base, which would be a broader curve, or an S-shaped base, which would produce a zigzag pattern. So the best fit for the missing term is C-shaped base curls.