Ta có:
$S_{xq}$ = 2π.r.h
=> $S_{xq}$ = 2π. 4 . 12 = 96π (cm2) ≈ 301,6 (cm2)
Vậy diện tích xung quanh của hình trụ này là: 301,6 cm2.
diện tích xung quanh hình trụ là:
Sxq=2pi.R.h=2.pi.4.12=96pi
nếu cần đổi luôn cả pi thì =301,44 cm2
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