Question

If ABC is an equilateral triangle, what is the measure of

Answer 1

The value of the exterior angle is the sum of the angles opposite. This is an equilateral triangle, so all angles are equal to 60 degrees.

60 + 60 = 120

So angle DAB is 120 degrees.

Answer 2

Triangle DAB's angle measurement add up to 180 degrees

Since it is an equilateral triangle, each angle is the same measurements, or 60 degrees

Angle DAC is a straight line, and has a total measurement = 180 degrees

180 - 60 = 120

Angle DAB = 120 degrees


Hope this helps