Penjelasan dengan langkah-langkah:
Luas selimut tabung = 2πrt
440 cm² = 2 × 22/7 × r × 10 cm
440 cm² = 440/7 × r
440 cm² × 7 = 440 cm × r
3080 cm² = 440 cm × r
r = 3080 cm² / 440 cm
r = 7 cm
Luas permukaan tabung = 2πr (r + t)
= 2 × 22/7 × 7(7 + 10)
= 44(17 )
= 748 cm²
____________________________________________
L = 4 × π × r²
L = 4 x 3,14 x 15 x 15
L = 12.56 x 15 x 15
L = 12.56 x 225
L = 2.826 cm
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Penjelasan dengan langkah-langkah:
Luas selimut tabung = 2πrt
440 cm² = 2 × 22/7 × r × 10 cm
440 cm² = 440/7 × r
440 cm² × 7 = 440 cm × r
3080 cm² = 440 cm × r
r = 3080 cm² / 440 cm
r = 7 cm
Luas permukaan tabung = 2πr (r + t)
= 2 × 22/7 × 7(7 + 10)
= 44(17 )
= 748 cm²
____________________________________________
L = 4 × π × r²
L = 4 x 3,14 x 15 x 15
L = 12.56 x 15 x 15
L = 12.56 x 225
L = 2.826 cm
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