A rectangle has a perimeter of 320 cm and a length of 70 cm, what is its area in square centimeters?
一个长方形的周长是320厘米，长70厘米，它的面积是多少平方厘米？
<gadget id="calculator">320 / 2</gadget>
<output>160</output>

<gadget id="calculator">160 - 70</gadget>
<output>90</output>

<gadget id="calculator">90 * 70</gadget>
<output>6_300</output>

<result>6_300</result>