cari kelilingnya dong plis

1.
r = 3,5 cm
K = 2.π.r
K = 2 x 22/7 x 3,5
K = 2 x 22 x 0,5
K = 22 cm

2.
D = 56 cm
r = D/2 = 56/2 = 28 cm

K = 2.π.r
K = 2 x 22/7 x 28
K = 2 x 22 x 4
K = 176 cm

3.
r = 6 cm
K = 2.π.r
K = 2 x 3,14 x 6
K = 12 x 3,14
K = 37,68 cm

4.
D = 80 cm
r = D/2 = 80 / 2 = 40 cm

K = 2.π.r
K = 2 x 3,14 x 40
K = 80 x 3,14
K = 251,2 cm