Question

Triangle A B F is shown. Line B F is extended through point G. Line F A is extended through point C. A line is drawn from point A to point D. A line is drawn from point F to point E.
Which represents an exterior angle of triangle ABF?

∠BAD
∠AFE
∠CAD
∠CAB

Answer 1

An exterior angle is formed by one side of the triangle and the extension of an adjacent side. Extending FA through C makes AC the extension of side AF, so the exterior angle at A is between AC and AB, i.e. ∠CAB.