How many centimeters of aluminum alloy strips are needed to make an aluminum alloy frame for a square mirror with a side length of 80 cm.
给一面边长80厘米的正方形镜子做铝合金边框，大约需要多少厘米的铝合金条．
<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<result>320</result>