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d = 14 cm
D = 28 cm
K = π d
K1 = 1/2 × 22/7 × 28 cm = 44 cm
K2 = 2 × 1/2 × 22/7 × 14 cm = 44 cm
K seluruh = 44 + 44 = 88 cm
b.
r = 14 cm
K lingkaran = 2 × 1/4 × 2 × 22/7 × 14 cm
= 44 cm
K seluruh = 44 cm + (4 × 26 cm)
= 44 + 104
= 148 cm