In \(\triangle ABC\), the circumcenter and orthocenter are collinear with vertex \(A\). Which of the following statements must be true?

(1) \(\triangle ABC\) must be an isosceles triangle.

(2) \(\triangle ABC\) must be an equilateral triangle.

(3) \(\triangle ABC\) must be a right triangle.

(4) \(\triangle ABC\) must be an isosceles right triangle.

Guest Nov 12, 2020

edited by
Guest
Nov 12, 2020