一道三角题的几何解释５３２１００广西扶绥二中黎民生，甘保华本文给出此题的一个构图独到的几何解释，下面用一种几何方法来证明．由于无论上ＡＢＣ是锐角、或直角、或钝角三角形，总有垂足，Ｈ＇为垂心，从而易证Ｆ＇、Ｂ＇、Ｃ＇、Ｅ＇四点共圆．我０］称西Ｄ’Ｅ’Ｆ... Geometric interpretation of a trigonometric problem 532100 Fusong 2nd Middle School Li Minsheng, Gan Baohua This article gives a unique geometric interpretation of the problem. The following uses a geometric method to prove. Because whether the ABC is an acute angle, or a right angle, or an obtuse triangle, there is always a vertical foot, H’ is a vertical heart, which makes it easy to prove that F’, B’, C’, E’ four points in a circle. I 0] called West D’E’F...