生成一个给我讲解这道题的视频---Question Stem: 五 求下列图中阴影部分的面积。 Figure (1): Description: Geometric figure showing a shaded area composed of two adjacent triangular regions on a horizontal base, with an unshaded square positioned above the right part. The shaded area is bounded by a horizontal base, a vertical line segment, and a slanted line segment. - The horizontal base is divided into two segments of length 4 cm and 8 cm from left to right. - A vertical line segment of length 4 cm extends upwards from the end of the 4 cm base segment. - The shaded area includes a region on the left with a horizontal base of 4 cm and a height of 4 cm (forming a right triangle). - The shaded area includes a region on the right with a horizontal base of 8 cm, bounded on the left by the top of the 4 cm vertical line segment and sloping down to the right end of the 8 cm base segment (forming a triangle with base 8 cm and height 4 cm). - An unshaded square with side length 8 cm is positioned above the 8 cm base segment, with its bottom right corner aligned with the end of the 8 cm base segment. Dimensions: - Left horizontal base segment: 4 cm - Vertical height at 4 cm mark: 4 cm - Right horizontal base segment: 8 cm - Side length of the unshaded square: 8 cm Handwritten text below Figure (1): 118(cm²) Figure (2): Description: Shaded right triangle. Dimensions: - Horizontal base: 6 cm - Vertical height: 9 cm Handwritten text below Figure (2): 6×6÷9=4cm²)