Question

No 6 ya tolong secepatnya

Answer 1

Rumus:
Keliling (K) = 2 x π x r

Diketahui:
d = 20 cm
r = d/2 = 20/2 = 10 cm
π = 3,14

Ditanya:
K = ??

Jawab:
K = 2 x π x r
K = 2 x 3,14 x 10
K = 62,8 cm (A)