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r=14 cm
π=22/7
a)
V=⅓πr²t
t=3V:(πr²)
t=3×2464:(22/7×14×14)
t=12 cm
b)
s²=t²+r²
s²=12²+14²
s²=144+196
s=√340
s=2√85 cm
s=18,43 cm
c)
Ls=πrs
Ls=22/7×14×18,43
Ls=44×18,43
Ls=811 cm
v=1/3 vi rkuadrat t
2464=205.8 t
t= 11.8
= 12cm
untuk luas selimut kerucut
L= vi r s
= 22/7 × 14 × 18
= 792 cm kuadrat