A 3x3 grid follows a pattern where each cell contains a shape with a certain number of sides, and a number of dots inside it equal to the number of sides minus 2:

Row 1: triangle (1 dot), square (2 dots), pentagon (3 dots)

Row 2: square (2 dots), pentagon (3 dots), hexagon (4 dots)

Row 3: pentagon (3 dots), hexagon (4 dots), ?

Which figure completes the pattern?