jika pipa besi berbentuk silinder,panjangnya 4m,dan diameternya 14mm.hitunglah:a.volume pipa besi.b.berapa kg berat besi jika setiap 1cm3 beratnya 12 gram

t = 4m = 400 cm
d = 14 mm = 1,4 cm
r = 1,4 / 2 = 0,7 cm

V = 22/7 x 7/10 x 7/10 x 400
V = 22/10 x 7 x 40
V = 22 x 7 x 4
V = 616 cm^3

Berat = 616 cm^3 x 12 gr/cm^3
Berat = 7392 gram