一个底面半径是6厘米的圆柱形玻璃器皿里装有一部分水，水中浸没着一个高9厘米的圆锥形铅锤．当铅锤从水中取出后，水面下降了0.5厘米．这个圆锥形铅锤的底面积是多少平方厘米？
直接写出下面各题得数．15×= ﹣= += ×25%= 7÷=÷= ÷10= ×= 1÷÷= ÷×=
直接写出得数．×= += ÷= 1﹣=÷3= 8×25%= ÷= ﹣20%=
直接写出得数：9÷= ；÷= ；×= ；×0÷= ．
直接写得数×= ×= 21×= 6÷=10÷= +0.5= 1﹣= 2÷0.2=÷= ：=
直接写出得数．100÷10%= 12÷= 6.3÷0.07= 10﹣= ÷22=+= ×= ÷= ×= 24×=
= 
﹣
= 
+
= 
×25%= 7÷
=
÷
= 
÷10= 
×
= 1÷
÷
÷
×
=
×
= 
+
= 
÷
= 1﹣
=
÷3= 8×25%= 
÷
= 
﹣20%=
= ；
÷
×
= ；
×0÷
= ．
×
= 
×
= 21×
= 6÷
=
= 
+0.5= 1﹣
= 2÷0.2=
÷
= 
：
=
= 6.3÷0.07= 10﹣
= 
÷22=
+
= 
×
= 
÷
= 
×
= 24×
=
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