Question 123
A convex $s$-gon is divided into $q$ quadrilaterals, $b$ of which are not convex. Prove that
$$
q \geq b + \frac{s-2}{2}.
$$
$$
q \geq b + \frac{s-2}{2}.
$$
MathNet 2022-part-04 — 197 problems (EN–VI) Question 123
Math Olympiad Vault · MathNet 2022-part-04 — 197 problems (EN–VI)