Maggie found the area of the irregular figure by dividing it into a triangle and a rectangle. A figure can be broken into a rectangle and triangle. The rectangle has a base of 6 centimeters and height of 5 centimeters. The triangle has a base of 3 centimeters and height of 2 centimeters.

Her work is shown below.

Area of rectangle = bh = (6 cm)(5 cm) = 30 Centimeters squared
Area of triangle = bh = (2 cm)(3 cm) = 6 Centimeters squared
Area of entire figure = 30 Centimeters squared + 6 Centimeters squared = 36 Centimeters squared

Which best describes the error that Maggie made?