Question

Which of the following explains why all circles are similar?

All circles are polygons, and therefore all circles have the same shape.

All circles have the same shape but different radii.

All circles have the same radii but different shapes.

All circles have the same diameter, and therefore have the same shape.

Answer 1

All circles have the same shape but different radii.

Explanation:

Answer 2

Among the statements provided above only the 2nd option which is "all circles have the same shape but different radii" explains why all circles are similar.  Circle can have the same shape but have different radii and diameters as this are the bases of the size of the circle.