Cutting needles have _ points and _ edges. The reverse cutting needle edge is on the _ (or convex) curvature

Cutting needles typically have three points and three edges. The reverse cutting needle edge is on the concave curvature.

In the context of sewing and surgical needles, the term "cutting needle" refers to a type of needle that has a cutting edge, which is particularly useful for stitching through tough tissue or materials. The unique design features three cutting edges that meet at a point and are strategically placed to ensure efficient penetration and a smooth sewing experience.

On a reverse cutting needle, the cutting edges are located on what is known as the concave side, meaning that when the needle is inserted, the cutting edges facilitate a slicing action that is especially effective for creating precise and clean incisions in challenging materials. This design minimizes tissue trauma and allows for smoother passage through the material being sewn.