Correct option is B
To analyze the relationship between Hexagon and Septagon, let's break it down:
Observing the relationship:
Hexagon: A polygon with 6 sides.
Heptagon: A polygon with 7 sides.
The relationship is based on the progression in the number of sides of the polygon.
Now, check options:
(a) Radius : Diameter
Radius is half the length of the diameter.
This is not a progression-based relationship.
(b) Triangle : Rectangle
Triangle has 3 sides, and a rectangle has 4 sides.
This represents a progression in the number of sides, similar to the given pair.
(c) Chord : Circle
A chord is a line segment joining two points on the circle.
No progression relationship here.
(d) Area : Square
Area is a measure, while a square is a shape.
This is unrelated to the concept of polygons or progression.
Thus, correct option is (b).