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| BANGUN RUANG SISI LENGKUNG |Kelas : 9
Diket : t = 20 cm
d = 14 cm => r = 7 cm
Dit : Lpt =.........?
Vt =............?
Penyelesaian :
Lp = 2.phi.r(r+t)
= 2.22/7.7(7+20)
= 44.27
= 1188 cm²
V = phi.r².t
= 22/7.7.7.20
= 3080 cm^3
d=14cm
r=7cm
dit: L.p tabung dan v.tabung?
jwb: L.p tabung =2πr(r+t)
=2*22/7*7(7+20)
=44(27)
=1188cm2
v.tabung= πr2t
=22/7*7*7*20
=3080cm3