conical metal casting with a base radius of 10 cm is completely submerged in a cylindrical container with a base radius of 15 cm, and the water level rises by 1.2 cm. How tall is the conical metal casting in centimeters?
把一个底面半径为10厘米的圆锥形金属铸件完全浸没在底面半径是15厘米的圆柱形容器中，水面上升了1.2厘米．这个圆锥形金属铸件的高是多少厘米？
<result>8.1</result>