Tabung (tanpa tutup)
r = 20 ÷ 2 = 10 cm
L = π × r × (r + 2 × t)
= 3,14 × 10 × (10 + 2 × 28)
= 3,14 × 10 × (10 + 56)
= 3,14 × 10 × 66
= 2.072,4 cm²
Kerucut (tanpa alas)
L = π × r × s
= 3,14 × 10 × 26
= 816,4 cm²
Luas = 2.072,4 + 816,4 = 2.888,8 cm²
Jawaban: C.
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Tabung (tanpa tutup)
r = 20 ÷ 2 = 10 cm
L = π × r × (r + 2 × t)
= 3,14 × 10 × (10 + 2 × 28)
= 3,14 × 10 × (10 + 56)
= 3,14 × 10 × 66
= 2.072,4 cm²
Kerucut (tanpa alas)
L = π × r × s
= 3,14 × 10 × 26
= 816,4 cm²
Luas = 2.072,4 + 816,4 = 2.888,8 cm²
Jawaban: C.