AAS Criteria

Move points A, B and C to change the size and shape of the triangles. Use the toolbar to measure segment lengths, angles or area.

If angle B is congruent to angle E, and angle C is congruent to angle F, what do you notice about angles A and D?

Given that angle A is congruent to angle D, what triangle congruence criteria can now be used to justify AAS triangle congruence? Explain