帮我解答一下这道题---14. 如图所示, 长方形ABCD 的面积为36平方厘米. E、F、G 分别为边 AB、BC、CD 的中点, H 为AD 边上任意一点, 则阴影部分的面积是________平方厘米. Chart/Diagram Description: - Type: Geometric figure (rectangle with internal lines and shaded regions). - Main Elements: - A rectangle labeled ABCD. Vertex A is at the top-left, B at the bottom-left, C at the bottom-right, and D at the top-right. - The sides are implicitly labeled by the vertices (AB, BC, CD, AD). - Point E is located on side AB. - Point F is located on side BC. - Point G is located on side CD. - Point H is located on side AD. - Straight lines connect H to E, H to F, and H to G. - There are two shaded regions within the rectangle: - One shaded region is the triangle with vertices A, E, and H. - The other shaded region is the triangle with vertices H, F, and G. Other Relevant Text: - 长方形ABCD 的面积为36平方厘米. (Area of rectangle ABCD is 36 square centimeters.) - E、F、G 分别为边 AB、BC、CD 的中点 (E, F, G are midpoints of sides AB, BC, CD respectively). - H 为AD 边上任意一点 (H is an arbitrary point on side AD). - 阴影部分的面积是 (The area of the shaded part is) [blank space] 平方厘米 (square centimeters).