Question

ac = bc which of the following is the reason for line 4 in the proof? cpcte if two angles are equal in a triangle, then the sides opposite are equal. definition of isosceles triangle.

Explanation:

We have shown that \(\angle1=\angle2\) (from steps 1 - 3). In a triangle, if two angles are equal, then the sides opposite those angles are equal. Here, in \(\triangle ABC\), \(\angle1\) is opposite \(BC\) and \(\angle2\) is opposite \(AC\).

Answer:

If two angles are equal in a triangle, then the sides opposite are equal.