Answer:
option (d)
Step-by-step explanation:
An equilateral triangle is a triangle whose all the sides are equal and all the angles are same.
There are three angles in a triangle and the according to the property of the angles of a triangle, the angle sum of a triangle is 180°.
So, in an equilateral triangle, the measure of each angle is 60°.
[tex]3x-12= 60[/tex]
3x = 60 + 12
3x = 72
x = 24
option (d)
