There are 2 small rods each 8 cm long and 4 cm long. Choose three of them to form a triangle. What is its perimeter? how many centimeters
有长8厘米和4厘米的小棒各2根，从中选择三根围成一个三角形，它的周长是多少？多少厘米
<gadget id="calculator">8 + 8 + 4</gadget>
<output>20</output>

<result>20</result>