Jawabanmu

2014-09-03T16:29:10+07:00
Keliling alas kerucut = 3.14 x D
100.48 = 3.14 x D
D = 100.48 : 3.14
D = 32
r = 32 : 2
r= 16

S² = r² + t²
20² = 16² + t²
t²= 400-256
t²= 144
t= √144
t= 12
4 4 4