For a triangle, if the base increases by 2 cm, the height remains the same, and the area increases by 12 cm2; if the height decreases by 3 cm, the base remains the same, and the area decreases by 12 cm2. Find the area of the triangle.
一个三角形，如果底增加2厘米，高不变，面积增加12平方厘米；如果高减少3厘米，底不变，面积减少12平方厘米．求三角形面积．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<result>48</result>