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diameter (d) = 21 x 2 = 42 cm
phi = 22/7
keliling seperempat lingkaran 1 =
1/4 × phi × d = 1/4 × 22/7 × 42 = 33 cm
keliling seperempat lingkaran 2 =
1/4 × phi × d = 1/4 × 22/7 × 42 = 33 cm
keliling seluruhnya =
33 + 21 + 21 + 33 + 21 + 21 = 150 cm