In plastic surgery, the biogeometry of flaps plays a critical role in achieving optimal outcomes. The precise design and geometric understanding of flaps are essential for ensuring proper blood supply, minimizing tension, and achieving seamless integration with surrounding tissues. A well-planned flap geometry not only enhances aesthetic results but also improves functional recovery and reduces the risk of complications. Mastery of biogeometric principles allows surgeons to tailor each procedure to the patient’s unique anatomy, ensuring both form and function are restored effectively. Biogeometry of flaps is inevitably asked during the MCh/DNB exams as well. In this masterclass we discuss the basic of biogeometry of flaps in a concise and crisp manner. Draw along with the videos to have a better clarity of the biogeometry. Happy viewing!