A square tabletop with a side length of 90 centimeters, how many square centimeters is needed to match it with a glass of the same size as the tabletop
一张正方形桌面，边长是90厘米，要配上一块与桌面同样大的玻璃，要多少平方厘米
<gadget id="calculator">90 * 90</gadget>
<output>8_100</output>

<result>8_100</result>