MathDB
distance of feet of 2 altitudes = 1/2 R

Source: IV Soros Olympiad 1997-98 R2 10.3 https://artofproblemsolving.com/community/c2416727_soros_olympiad_in_mathematics

June 1, 2024
geometrycircumradius

Problem Statement

What can angle BB of triangle ABCABC be equal to if it is known that the distance between the feet of the altitudes drawn from vertices AA and CC is equal to half the radius of the circle circumscribed around this triangle?