試解

來源: 於 2024-02-04 17:28:15 [舊帖] [給我悄悄話] 本文已被閱讀：次

Angle C = angle D = angle AMN = angle CMH

so triangle MCH is isosceles. Because BMC=90, triangle MBH is also isosceles.

MH = BC/2=2.