Online Geometry Problem 699: Equilateral Triangle, Circle, Circular
Segment, Midpoint, Metric Relations.
Level: High School, Honors Geometry, College,
Mathematics Education
The figure shows an equilateral triangle ABC
inscribed in a circle. D is the midpoint of arc AC and the equilateral
triangle DEF is inscribed in the circular segment AC. If AB =12 , find
DE.
