How many diagonals does each of the following have?

A. A convex quadrilateral

B. A regular hexagon

C. A triangle

(a) There are 2 diagonals in a convex quadrilateral.(See in figure below)

(b) There are 9 diagonals in a regular hexagon

(Represented in figure)

(c) A triangle does not have any diagonal in it

(Represented in figure)

9