1.
jawaban :
a. Diketahui :
r (jari-jari) = 4 cm
t (tinggi) = 12 cm
s2 = 12^2 + 4^2
s =V144 + 16
= V160
= V16.10
s = 4V10 cm
luas = πr (s +r)
= π.4 cm (4V10 cm + 4cm)
= π.4cm .4cm (V10 +1)
= 16 (V10 +1) π cm2
= 16 (1 + 10 )π cm2
volume = 1/3.πr2.t
= 1/3.π.4cm.4cm. 12 cm
= 64π cm3
b. Diketahui :
d = 12 cm
r = 6 cm
s = 10 cm
t2 = 10^2 -6^2
t = V100 - 36
= V64
= 8 cm
luas = πr (s +r)
= π.6cm (10cm +6cm)
= π.6cm.16 cm
= 96 π cm2
V = 1/3.πr2.t
= 1/3 π. 6 cm. 6 cm. 8 cm
volume = 96π cm3