parallelogram formed by two identical triangles has an area of 60 square centimeters and a height of 4 centimeters. How many centimeters is the base of each triangle?
两个完全一样的三角形拼成的平行四边形面积是60平方厘米，高4厘米．每个三角形的底是多少厘米．
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<result>15</result>