The master tailor received an order to make 200 square handkerchiefs with a side length of 3 decimeters. How much fabric does the master need to prepare?
裁缝师傅接到订单，要做200条边长是3分米的正方形手帕，那师傅需要准备多大面积的布料？
<gadget id="calculator">3 * 3 * 200</gadget>
<output>1_800</output>

<result>1_800</result>