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Verified answer
A.Keliling
= 2 Π r
= 2 × 22/7 × 42
= 2 × 22 × 6
= 44 × 6
= 264 cm
Luas
= Π r²
= 22/7 × 42 × 42
= 22 × 6 × 42
= 132 × 42
= 5.544 cm²
b.
Keliling
K lingkaran 1
= 2 Π r
= 2 × 3,14 × 18
= 113,04 cm
K lingkaran 2
= 2 Π r
= 2 × 3,14 × 12
= 75,36
K daerah yg diarsir
= 113,04 - 75,36
= 37,68 cm
Luas
Luas lingkaran 1
= Π r²
= 3,14 × 18 × 18
= 1.017,36 cm²
Luas lingkaran 2
= Π r²
= 3,14 × 12 × 12
= 456,16 cm²
Luas daerah yang diarsir
= 1.017,36 - 456,16
= 561,2 cm²
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