Question

Nomer 19 & 20 ya gaes
pake cara
tolong untuk besok

Answer 1

Verified answer

19][
Tabung
t = 14 cm
V = 2156 cm³
πr²t = 2156
r² = 2156/(πt)
r = √(2156/(22/7 . 14))
r = √49
r = 7 cm

Luas seluruh permukaan tangki
= luas permukaan tabung tanpa tutup
= πr² + 2πrt
= πr(r + 2t)
= 22/7 . 7 (7 + 2.14)
= 22 × 35
= 770 cm²

20][
Tiang berbentuk tabung
d = 1 m
r = d/2 = 1/2 m
t = 10 m

Volume tiang
= πr² t
= 3,14 × 1/4 × 10
= 7,85 m³

Berat tiang
= 7,85 × 150
= 1177,5 kg