There is a triangle with an area of 10 square centimeters, what is the area in square centimeters after it is enlarged at a ratio of 3:1?
有一个三角形，面积是10平方厘米，将它按3：1的比放大后，面积是多少平方厘米．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">10 * 9</gadget>
<output>90</output>

<result>90</result>