What is the total area of 25 triangles with a base length of 6 meters and a height of 4 meters?
底边长6米，高4米的三角形25个，面积一共是多少平方米．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">6 * 2 * 25</gadget>
<output>300</output>

<result>300</result>