mohon dijawab, thanks.

5. L.s.t = 2 × phi × r × t
= 2 × 22/7 × 7 × 15
= 44 × 15 = 660 cm^2
6. L.s.t = 2 × phi × r × t
= 2 × 22/7 × 7 × 20
= 44 × 20 = 880 cm^2
7. V.t = phi × r^2 × t
3080= 22/7 × 7^2 × t
3080= 22/7 × 49 × t
3080= 154 × t
154 × t = 3080
t = 3080/154 = 20cm
8. V.t = phi × r^2 × t
= 3,14 × 25^2 × 50
= 3,14 × 625 × 50
= 1962,5 × 50 = 98125 cm^3
jika ada yang kurang dimengerti silakan di tanyakan......
semoga membantu.....☺

Langsung aja ya?

5)
Lst = 2 × phi × r × t
Lst = 2 × 22/7 × 7 × 15
Lst = 660 cm^2

6)
Lst = phi × d × t
Lst = 22/7 × 14 × 20
Lst = 880 cm^2 (a)

7)
V = phi × r^2 × t
3080 = 22/7 × 7 × 7 × t
3080 = 154 × t
t = 3080/154
t = 20 cm (d)

8)
V = phi × r^2 × t
V = 3,14 × 0,25 × 0,25 × 0,5
V = 0,098125 m^3
V = 0,098125 × 1000000 cm^3
V = 98125 cm^3 (d)