(A) An equilateral triangle.
Circle:
- All points in a plane that are at a specific distance from a specific point, the center, form a circle.
- In other words, it is the curve that a moving point in a plane draws to keep its distance from a specific point constant.
Polygon:
- In geometry, a polygon is any closed curve made up of a collection of continuous line segments (sides) without any intersections.
- Triangles (three sides), quadrilaterals (four sides), and pentagons are the three simplest polygons (five sides).
Triangle:
- A polygon with three edges and three vertices is called a triangle.
- It is one of the fundamental geometric shapes.
- Triangle ABC is the designation for a triangle with vertices A, B, and C.
- In Euclidean geometry, any three points that are not collinear produce a distinct triangle and a distinct plane.
Therefore, Ethan is in the process of constructing (A) an equilateral triangle.
Know more about triangles here:
https://brainly.com/question/17335144
#SPJ2
