There are 180 degrees in total inside a triangle.
If something is equilateral that means that all the angles are equal.
180/3 equals 60 degrees.
That means that all angles of an equilateral triangle are always equal to each other and if you must know, are 60 degrees
Rules for adding: if the bases are the same you can add them, and subtracting happens in a fraction
Answer:
z = 10
Step-by-step explanation:
the steps have been attached above