The length and width of a rectangle in centimeters are prime numbers, its perimeter is 36 centimeters, and its area is at most how many square centimeters.
一个长方形的长和宽的厘米数都是质数，它的周长是36厘米，它的面积至多是多少平方厘米．
<gadget id="calculator">7 * 11</gadget>
<output>77</output>

<result>77</result>