Respuesta :
The answer is 30. An equilateral triangle is a triangle with all three sides equal. The angle measurements of a triangle always add up to 180 so the angle measurements are 60 for all three sides. 60 divided by 2 is 30 so that is your answer.
If an angle is x^2 then:
x^2+x^2+x^2=180 since there are 180 degrees in a triangle
3x^2=180
x^2=180/3
x^2=60
sq root of x^2= sq root of 60
x=7.7
