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Verified answer
Keliling LingkaranD = 21 cm - 7 cm
D = 14 cm
r = D/2
r = 14 cm / 2
r = 7cm
K = 2.π.r
K = 2 x 22/7 x 7 cm
K = 2 x 22 cm
K = 44 cm
Keliling setengah lingkaran
D = 14 cm
r = D/2
r = 14 cm / 2
r = 7 cm
K = 1/2 . 2 . π . r
K = π.r
K = 22/7 x 7cm
K = 22 cm
Keliling daerah yang diraster
K = 14 cm + 44 cm + 22 cm
K = 80 cm