ada yang ngerti gaa? tolong dong hehe :)

6.
Luas permukaan tabung tanpa tutup
D = 14 cm
r = D/2 = 14/2 = 7 cm
t = 30 cm

L = π.r(r + 2t)
L = 22/7 x 7 ( 7 + 2(30))
L = 22 (7 + 60)
L = 22 x 67
L = 1.474 cm²

Luas selimut kerucut
r = 7 cm
t = 24cm
s² = r² + t²
= 7² + 24²
= 49 + 576
= 625
s = √625
s = 25 cm

L = π.r.s
L = 22/7 x 7 x 25
L = 22 x 25
L = 550 cm²

Luas permukaan seluruhnya
1.474 + 550 = 2.024 cm²

7.
Volume setengah bola
r = 5 cm
V = 1/2 x 4/3 x π x r³
V = 1/2 x 4/3 x 3,14 x 5³
V = 2/3 x 3,14 x 125
V = 261,67 cm³

Volume kerucut
V = 1/3 x π x r² x t
V = 1/3 x 3,14 x 5² x 12
V = 3,14 x 25 x 4
V = 314 cm³

Volume seluruhnya
261,67 + 314 = 575,67 cm³