1) The coordinates of the vertices of REA can be verified by the figure of the triangle REA and NOD
What is vertex of a triangle
The term vertex as used in geometry refers to a point where two or more lines rays or line segments meet.
A triangle has three vertices, and each vertex is a point where two sides of the triangle intersect. These points are essential in defining the shape and structure of the triangle.
The three vertices of a triangle are often labeled as R, E and A. The coordinates are
R (2, 4)
E (3, 0)
A (1, 0)