To find the area of the shaded triangle, we need to know the base and height of the triangle.Assuming the grid is a square centimeter grid, and the shaded triangle is a right triangle with base and height equal to the length of the grid:Base = 3 cm (3 smallest squares)Height = 3 cm (3 smallest squares)Area of triangle = (base × height) / 2= (3 × 3) / 2= 9 / 2= 4.5 square cm