I had a c section 8 months ago due to twin pregnancy my scar is on my public area and 10 cms is this right?

Reference line. The reference line for the "bikini cut" is the line where the scar would be hidden by a woman's bikini bottoms. This is less than 5 cm. If the scar is 10 cm above the pubic bone, the woman's body habitus may have dictated that.
Pubic area. A 10 cm scar in the pubic area is about right for a c-section scar.