Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2024-part-03 — 168 problems (EN–VI) Question 65

Math Olympiad Vault · MathNet 2024-part-03 — 168 problems (EN–VI)

Question 65

A convex quadrilateral $ABCD$ is such that $AB = 14$, $BC = 24$, $CD = 26$ and $DA = 16$. Its area is $360$. Find the area of the region of the plane inside the quadrilateral consisting of the points at distance at most $3$ from its perimeter.

(A) $100$
(B) $120$
(C) $120 + 9\pi$
(D) $156$
(E) $200$