用小学生的方式讲---**Question Stem:** The image presents a system of equations using geometric shapes as variables. The equations are: 1. □ + △ = 20 2. △ + △ + △ = ○ 3. □ + □ = ○ The question asks to find the value of ○. (求: ○ = _) **Mathematical Formulas/Equations (extracted as text):** * Square + Triangle = 20 * Triangle + Triangle + Triangle = Circle * Square + Square = Circle * Find: Circle = ? **Chart/Diagram Description:** * **Type:** Not a chart or diagram in the traditional sense, but a visual representation of mathematical equations using symbols. * **Main Elements:** * **Shapes:** A square (□), a triangle (△), and a circle (○) are used as variables. * **Operators:** Plus sign (+) and equals sign (=) are used for mathematical operations. * **Numbers:** The number 20 is present. * **Text:** Chinese character "求" (qiú), meaning "find" or "求" followed by a colon, indicating the question. * **Layout:** The equations are presented vertically, one per line. The question is on the last line. * **Relative Position:** The question "求: ○ = _" is at the bottom, indicating the objective of the problem based on the preceding equations.