Jawaban:
L alas tabung = πr²
= 22/7 × 7²
= 154 cm²
L selimut tabung
= 2πrt
= 2 × 22/7 × 7 × 10
= 440 cm²
L cat = L alas + L selimut
= 154 + 440
= 594 cm²
¹/4 permukaan yg dicat
= ¹/4 × 594
= 148,5 cm² ( A. )
[[ SN ]]
Jawab:
148,5 cm²
Penjelasan dengan langkah-langkah:
diketahui
d = diameter = 14 cm
r = jari-jari = 14 cm / 2 = 7 cm
t= tinggi = 10 cm
luas permukaan tabung tanpa tutup
Lp = πr² + 2πrt = π(r² + 2rt) = 22/7 (7² + 140) = 22/7 (189) = 594 cm²
luas permukaan tabung yang dicat merah
L = 1/4 Lp = 1/4 × 594 cm² = 148,5 cm²
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Jawaban:
L alas tabung = πr²
= 22/7 × 7²
= 154 cm²
L selimut tabung
= 2πrt
= 2 × 22/7 × 7 × 10
= 440 cm²
L cat = L alas + L selimut
= 154 + 440
= 594 cm²
¹/4 permukaan yg dicat
= ¹/4 × 594
= 148,5 cm² ( A. )
[[ SN ]]
Jawab:
148,5 cm²
Penjelasan dengan langkah-langkah:
diketahui
d = diameter = 14 cm
r = jari-jari = 14 cm / 2 = 7 cm
t= tinggi = 10 cm
luas permukaan tabung tanpa tutup
Lp = πr² + 2πrt = π(r² + 2rt) = 22/7 (7² + 140) = 22/7 (189) = 594 cm²
luas permukaan tabung yang dicat merah
L = 1/4 Lp = 1/4 × 594 cm² = 148,5 cm²