Determine whether [math]\triangle ABC[/math] with vertices [math]A (–4, 5)[/math], [math]B (–1, –4)[/math], and [math]C (5, 2)[/math] is an isosceles triangle. If it is isosceles, name a pair of congruent angles.

[list=1][br][*]Use the distance formula to calculate the length of each side.[br][*]Determine if the triangle is isosceles.[br][*]Identify congruent angles.[br][/list][br][br]This applet is provided by Walch Education as supplemental material for their mathematics programs. Visit www.walch.com for more information.