tolong bantu aku yah pleaseee.

13. c

maaf jika salah

12.v kerucut=1/3πr2t
314=1/3x3.14×5×5×t
314×3=78,5×t
942=78,5×t
t. =12
r=√144+25
=13 C.
13.v.kerucut= 1/3πr2t
= 1/3×3,14×5×5×18
=D.471