长方体有六个面，相对的面面积相等。它的表面积就是这六个面的面积之和。 比如这一个糖果盒，它的长是10厘米，宽5厘米，高3厘米。 一个盒子的表面积是2×（长×宽+长×高+宽×高）= 2×(50+30+15) =190平方厘米。---**Chart/Diagram Description:** * **Type:** 3D geometric figure (Rectangular Prism/Cuboid). * **Main Elements:** * A solid object depicted with three visible faces. * The front-left face is colored red. * The top face is colored yellow. * The front-right face is colored blue. * Visible edges are represented by black lines. * The object is shown in a perspective or isometric view, showing length, width, and height. * **Labels and Annotations:** None present. * **Relative Position and Direction:** The view shows the top, front-left, and front-right faces of the object simultaneously. **Textual Information:** * No textual information such as question stem, options, or other relevant text is present in the image.