Problem #PRU-58094

Problems Geometry Plane geometry Circles Central angle. Arc length and circumference Connection between the arc length, the angle, and the chord Methods Pigeonhole principle Pigeonhole principle (angles and lengths)
 13–15  4.0

Problem

Several chords are drawn through a unit circle. Prove that if each diameter intersects with no more than k chords, then the total length of all the chords is less than πk.