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1256 = 3,14 x r²
r² = 1256/3,14
= 400
r = 20
Luas seimut = 2πr(r + t)
= 2 x 3,14 x 20(20 + 48)
= 8540,8 cm²
1256 = 3,14 × r^2
r^2 = 1256 ÷ 3,14
r = √400
r = 20 cm
luas selimut tabung = 2 × Π × r × t
= 2 × 3,14 × 20 × 48
= 6028,8 cm persegi