MathDB
2017 Guts #24

Source:

November 25, 2022
2017Guts Round

Problem Statement

Consider all rational numbers of the form pq\tfrac{p}{q} where p,qp,q are relatively prime positive integers less than or equal to 88, and plot them on the xyxy-plane, where pq\tfrac{p}{q} corresponds to point (p,q)(p,q). Arrange the rationals in increasing order {P1,P2,,Pn}\{P_1,P_2,\dots,P_n\} and form a polygon by connecting points PiP_i and Pi+1P_{i+1} for 1i<n1\le i<n and connecting both P1P_1 and PnP_n to the origin. What is the area of the polygon?