In the figure below,ABCis an equilateral triangle. In order to havem= 60 degrees, which condition is necessary? think it is n=60 or https://www.d2l.mvps.mde.k12.ms.us/c.../quiz5b_q5.gif

CDEis an equilateral triangle.

CDEis an isosceles triangle.

n= 60 degrees

n= 90 degrees