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Triangle DEF is an isosceles, so AngleDEF Is-congruent-toAngleDFE.

A horizontal line has points C, F, E, G. 2 lines extend from the line at points F and E to form an isosceles triangle with point D.
Angle DEF measures 75°. What is the measure of angle CFD?

105°
125°
150°
165°

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Answered by GPT-5 mini
105°

Reason: Triangle DEF has equal base angles at E and F, so angle DFE = 75°. FE and FC are opposite directions on the same horizontal line, so the angle between DF and FC is the supplement of 75°: 180° − 75° = 105°.

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