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= 2 × 3,14 × 15
= 94,2 cm
Luas alas bawah = π × r²
= 3,14 × 15²
= 706,5 cm²
Luas selimut = 2 × π × r × t
= 2 × 22/7 × 15 × 21
= 1.980 cm²
Luas permukaan tanpa tutup = Luas alas bawah + Luas selimut
= 706,5 + 1.980
= 2.686,5 cm²
Luas permukaan = 2 × Luas alas + Luas selimut
= 2 × 706,5 + 1.980
= 1.413 + 1.980
= 3.393 cm²
Volume tabung = π × r² × t
= 22/7 × 15² × 21
= 14.850 cm³
2. r = d : 2
= 4 : 2
= 2 cm
Keliling atas = 2 × π × r
= 2 × 3,14 × 2
= 12,56 cm
Luas alas bawah = π × r²
= 3,14 × 2²
= 12,56 cm²
Luas selimut = 2 × π × r × t
= 2 × 3,14 × 2 × 5
= 62,8 cm²
Luas permukaan tanpa tutup = Luas alas bawah + Luas selimut
= 12,56 + 62,8
= 75,36 cm²
Luas permukaan = 2 × Luas alas + Luas selimut
= 2 × 12,56 + 62,8
= 25,13 + 62,8
= 87,92 cm²
Volume tabung = π × r² × t
= 3,14 × 2² × 5
= 62,8 cm³