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r = 28 ÷ 2 = 14 cm
B.
K = π × d
K = 22/7 × 28
K = 22 × 4
K = 44 cm
C.
L. P = S × S
L. P = 28 × 28
L. P = 784 cm²
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L. L = π × r²
L. L = 22/7 × 14 × 14
L. L = 22 × 2 × 14
L. L = 44 × 14
L. L = 616 cm²
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L. P -- L. L
784 -- 616
168 cm².
KETERANGAN
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L. P = Luas Persegi.
L. L = Luas Lingkaran