The area of a triangle is 15 square meters, if the base and height are enlarged by 3 times, what is its area in square meters?
一个三角形的面积是15平方米，若底和高都扩大3倍，它的面积是多少平方米．
<gadget id="calculator">15 * 3 * 3</gadget>
<output>135</output>

<result>135</result>