As you can see, it forms a line segment. A line segment is a part of a line which has two end points.

A region in the interior of a circle enclosed by an arc on one side and a pair of radii on the other two sides is called a sector. So, region I  is a sector.

A region in the interior of a circle enclosed by a chord and an arc is called a segment of the circle. So, region II is a segment.

Hence, region I shows a sector and region II shows a segment.

In above table, sides AB ll CD and AD ll BC.

So, there are two pairs of parallel lines in the rectangular table. 

 A is the point of intersection of lines BA & AD.

B is the point of intersection of lines AB & BC.

C is the point of intersection of lines BC & CD.

D is the point of intersection of lines AD & DC.

Hence they intersect at 4 different points.

From the  above figure we can find 

Radii :-$OA,OC$ and $OB$ ;

Chord :-$BC$ ;

Diameter :-$AB$  and

Centre :- $O$

Given that,
the figure as shown below:

Now,
on counting the number of triangles
in the given figure:
$\Delta$BAD, $\Delta$ BAE, $\Delta$BAC, $\Delta$DAE, $\Delta$DAC and $\Delta$EAC.

So, there are 6 triangles are there in the shown figure.

A point is a basic geometric shape that has zero dimension. A point in geometry determines location.

If a line segment is extended in both the directions, then we will get a line.

Line segment has two definite ends. A notebook has 12 line segments which is eventually sides of a notebook. 

A triangle is 3 sided polygon.

When we look at a star in the sky, it appears like a point in the sky. Hence it can be compared to a point.