Xiaohong took some matchsticks and arranged 9 squares. How many triangles can you make with these matches? (the edges of the graph do not coincide)
小红拿一些火柴棒摆了9个正方形．如果用这些火柴摆三角形，可以摆多少个？(图形的边不重合)
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>