Jawabanmu

2014-09-12T18:08:29+07:00
Diket. r= 3 cm, t= 4 cm, s= 5 cm (diketahui dari rumus Phytagoras)
a) Luas selimut:  \pi rs = 3,14.3.5= 47,1 cm
b) Luas alas:  \pi r² = 3,14.3.3 = 28,26 cm²
c) Luas permukaan:  \pi r (r+s) = 3,14.3 (3+5) = 9,42.8 = 75,36 cm
d) Volume:  \frac{1}{3} \pi r ^{2}  .t \frac{1}{3} .3,14.3.3.4 = 37,68 cm³
2014-09-12T18:15:00+07:00
Karena s = 5
jd Ls = phi x r x s = 3, 14 x 3 x 5 = 47, 1
Lalas = phi . r kwadrat = 3, 14 . 3 .3 = 28, 26
Lp = LS + LA = 75, 36
v=1/3.phi.r kwadrat.t = 1/3 . 3, 14 . 3 . 3 . 4 = 37, 68

maaf klo salaah