correct answer is: c) 1\;:\;1\;:\;1

Explanation

We know, the equilateral triangle all angles value is = 60°
So that, the ratio of an equilateral triangle angles :
60^\circ\;:\;60^\circ\;:\;60^\circ
\rightarrow 1\;:\;1\;:\;1
Ans: The ratio of an equilateral triangle is 1\;:\;1\;:\;1\;.

Other forms of this specific math question are:

1. Find the ratio of the angles of an equilateral triangle.
2. If we consider the angles of an equilateral triangle, what is their ratio?
3. Given an equilateral triangle, what is the ratio of its angles?