Keliling = 2πr
88 = 2 x 22/7 x r
88 = 44/7 x r
r = 88 : 44/7
= 88 x 7/44
= 2 x 7
= 14 cm
Luas permukaan tanpa tutup atas:
= π x r² + 2 x π x r x t
= π x r x (r + 2t)
= 22/7 x 14 x ( 14 + 2.7 )
= 22 x 2 x ( 14 + 14 )
= 44 x 28
= 1.232 cm²
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penyelesaian :
jari jari tabung :
2 x π x r = keliling
2 x 22/7 x r = 88 cm
44/7 x r = 88 cm
r = 7/44 x 88 cm
r = 14 cm
luas permukaan tabung tanpa tutup :
(π x r²) + (keliling alas x tinggi) =
(22/7 x 14²) + (88 x 7) =
616 cm² + 616 cm² =
1232 cm²
Maaf kalau salah
Keliling = 2πr
88 = 2 x 22/7 x r
88 = 44/7 x r
r = 88 : 44/7
= 88 x 7/44
= 2 x 7
= 14 cm
Luas permukaan tanpa tutup atas:
= π x r² + 2 x π x r x t
= π x r x (r + 2t)
= 22/7 x 14 x ( 14 + 2.7 )
= 22 x 2 x ( 14 + 14 )
= 44 x 28
= 1.232 cm²
Semoga membantu