All regular polygon:

a. have four sides
b. have an even number of sides
c. are symmetrical
d. are the same size

C. Are simmetrical

A. is false because only quadrilaterals have 4 sides

B. is false because polygons like equilateral triangle and regular pentagon have an odd number of sides

D. A polygon doesn't have an unique size. It changes every time, cause we can decide its size

The answer is C. are symmetrical.

Step-by-step explanation: There is a line of symmetry,  which is a line where one half of the polygon is a mirror image of the other side. This means that even if a polygon has 5 sides, for example, then it would still be symmetrical.

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step-by-step explanation:

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