A triangle and a parallelogram have the same area, and their heights are also equal. It is known that the base of the triangle is 15 centimeters, and how many centimeters is the base of the parallelogram.
一个三角形和一个平行四边形的面积相等，它们的高也相等，已知三角形的底是15厘米，平行四边形的底是多少厘米．
<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>