The length of the base of a triangle is 5 cm and the area is 30 cm2. What is the height of the base of the triangle in cm?
一个三角形的底边长5厘米，面积是30平方厘米，这个三角形底边上的高是多少厘米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">30 * (2/5)</gadget>
<output>12</output>

<result>12</result>