Question

An equilateral triangle has all sides the same length and all angles the same measure.

Answer 1

hey there!

Let measure of each angle be x

In triangle , we know that sum of angles is 180°

In equilateral triangle , all angles are equal

So our angles are x , x , x

=> x + x + x = 180°
=>3x= 180°
=> x = 180/3
=> x = 60°

Option 3 is correct

Hope this explanation helps you :)
Have a good day :)