David had a tile that was an equilateral triangle. He concluded that each angle of the triangle measured 60°. Which of the following statements BEST justifies David’s conclusion? A. All acute angles have a measure of 60 degrees
b. every equilateral triangle is also an isosceles triangle
c. The sum of the measures of the angles in a triangle is 180 degrees, and the three angles are congruent
D. The measure of an exterior angle of a triangle is the sum of measures of its two remote interior angles