There is a triangular cake and a parallelogram cake with the same area and the same height. It is known that the base of the parallelogram is 10 cm and the height is 6 cm. How many centimeters is the base of the triangle cake?
有一块三角形蛋糕和一块平行四边形蛋糕面积相等，高也相等，已知平行四边形的底是10厘米，高是6厘米．三角形蛋糕的底是多少厘米？
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>