What is the degree measure of one angle in an equilateral triangle?

In an equilateral triangle, all three sides are of equal length, and consequently, all three angles are equal as well. The sum of the interior angles in any triangle is always 180 degrees. Since all angles in an equilateral triangle are the same, you can determine the measure of each angle by dividing the total degrees by the number of angles.

Thus, each angle in an equilateral triangle can be calculated as follows:

[ \text{Measure of each angle} = \frac{180 \text{ degrees}}{3} = 60 \text{ degrees} ]

This demonstrates that each angle in an equilateral triangle measures 60 degrees, making it the correct answer.