Figure
There is no specific name.
A sphere
I do not know but: A closed figure is a figure with sides all around. (if the sides were fences and you were on the inside you could not get out witout climbing a fence)
To determine which segment must be congruent to segment RS, we would need to analyze the provided figure and the relationships between the segments. Typically, congruent segments are indicated by markings or specific properties such as being corresponding sides in similar triangles or parts of parallel lines cut by a transversal. Without the visual context, it is impossible to identify the specific segment that is congruent to RS. Please provide more information or a description of the figure for a more accurate answer.
No. It is close with four sides and four interior angles each 90 degrees.
There is no specific name.
A sphere
I do not know but: A closed figure is a figure with sides all around. (if the sides were fences and you were on the inside you could not get out witout climbing a fence)
polygon
Well a triangle has 3 sides and vertices.
A square...?
a polygon
no, but an eight sided figure you could use is an octagon. a figure 8 may be a figure and closed but, it has no sides and no line segments.
A simple polygon is a closed, straight-sided figure in which the sides do not overlap.
A heptagon is a 2-dimentional closed figure with seven sides, each side being a line segment
A simple closed figure formed by three or more segments is called a polygon. Regardless of how many sides a polygon has, all polygons will have as many vertices as it has sides.
It is a 'many sided' polygon