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- Jun 21st 2007, 06:42 PM #1

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## what is necessary for m to be 60?

In the figure below,*ABC*is an equilateral triangle. In order to have*m*= 60 degrees, which condition is necessary? think it is n=60 or

*CDE*is an equilateral triangle.

*CDE*is an isosceles triangle.

*n*= 60 degrees

*n*= 90 degrees

- Jun 21st 2007, 07:44 PM #2

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- Jun 21st 2007, 08:27 PM #3