Respuesta :

First, we need to know the area of one triangle of that polygon.
We have apothem 12.1 cm
Length of one side is 10cm

Area = bh/2
Area = 10*12.1 / 2
Area = 60.5 cm^2

Let us get the number of polygons by
= 484 / 60.5
= 8

So the polygon has 8 sides.