请生成一段课程视频包含图片这道题的核心内容，注意是课程内容，你可以理解为用课后题来反推出视频课程，讲清楚考点，知识点，该如何思考，针对小学五六年级的孩子，请尽量将题目讲得生动且容易理解 ---**Extraction Content:** **Question Stem:** 1. 如图所示, 大半圆的直径都是 3 厘米, 小半圆的直径都是 1 厘米, 阴影部分的面积是多少平方厘米? (π取 3.14) **Translation of Question Stem:** 1. As shown in the figure, the diameter of the large semicircle is 3 centimeters, the diameter of the small semicircle is 1 centimeter. What is the area of the shaded part in square centimeters? (π taken as 3.14) **Other Relevant Text:** (π取 3.14) which means "pi is taken as 3.14". **Diagram Description:** * **Type:** Geometric figure composed of semicircles and circles. * **Main Elements:** * A large shaded region shaped like an "S" curve or a yin-yang symbol, but with semicircles. * A large semicircle appears to form the outer boundary of the shaded region on the right side and the inner boundary on the left side. * Two small circles are placed on the horizontal diameter of what would be a larger circle encompassing the large semicircle. One small circle is on the left, and one is on the right. * The shaded region includes the large semicircle and excludes the two small circles. * A horizontal line segment passes through the centers of the two small circles and the center of the large semicircle (if considered part of a full circle). * Inside each small circle, there is a horizontal line segment labeled "1". This label indicates the diameter of the small circle is 1 centimeter. * The question states the diameter of the large semicircle is 3 centimeters. **Relative Position and Direction:** * The large shaded semicircle curves from bottom-left to top-right. * The two small circles are positioned horizontally, one on the left and one on the right, along the straight line forming the diameter of the large semicircle. * The shaded area encompasses the large semicircle and is formed by subtracting the areas of the two small circles from the area of the large semicircle (or potentially half of a full circle with diameter 3). **Note:** The question refers to a "large semicircle" and "small semicircles". However, the diagram shows a large semicircle and two small circles. The shaded region seems to be the area of the large semicircle minus the areas of the two small circles that are positioned on its diameter. Let's assume the question meant "small circles" instead of "small semicircles" given the diagram. **Structure:** The extraction includes the question number, the Chinese text of the question, its English translation, the instruction regarding the value of pi, and a detailed description of the geometric diagram. There are no options provided in the image.