

Online Geometry
Problem 754: Equilateral Triangle, Center, Angle, 60
Degrees, Perimeter. Level: High School, College,
Mathematics Education

The figure shows an equilateral triangle ABC with
center O. D and E are on AB and BC, respectively, so that angle DOE = 60
degrees. Prove that the perimeter of triangle BDE is equal to the
measure of AC.
This entry contributed by Ajit Athle.







