The area of a triangle is 36 square meters. If its base remains unchanged and its height doubles, what is its area?
一三角形的面积是36平方米，如果它的底不变，高扩在2倍，那么它的面积是多少．
<gadget id="calculator">36 * 2</gadget>
<output>72</output>

<result>72</result>