Answer:
[tex]\huge\boxed{\sf x = 20}[/tex]
Step-by-step explanation:
=> Since it is an equilateral (Having all angles and all sides equal) triangle, so every angles will be equal to the other.
=> The sum of the measures of interior angles of triangle add up to 180 degrees.
So,
3x + 3x + 3x = 180
9x = 180
Divide both sides by 9
x = 20
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807
