MathDB

2018.8.3

Part of Kyiv City MO Juniors 2003+ geometry

Problems(1)

angle wanted, isosceles, altitudes, rectangle (2018 Kyiv City MO 8.3)

Source:

9/11/2020
In the isosceles triangle ABCABC with the vertex at the point BB, the altitudes BHBH and CLCL are drawn. The point DD is such that BDCHBDCH is a rectangle. Find the value of the angle DLHDLH.
(Bogdan Rublev)
geometryrectangleisoscelesangles