Each small square on the grid is 1 cm². Which estimate best describes the area of this figure? Responses 15 cm² 15 cm² 20 cm² 20 cm² 25 cm² 25 cm² 35 cm² 35 cm² An 8-sided irregular polygon graphed on a coordinate plane. Some vertices of the polygon do not lie on intersections of the grid. The region inside the polygon is shaded blue. There are 20 whole unit squares that are completely shaded or almost completely shaded. Approximately 4 unit squares are more than halfway shaded. Approximately 4 unit squares are a quarter shaded.