1.a) Keliling = 2 π r = 2 × 22/7 × 21 = 132 cm
Luas = π r² = 22/7 × 21 × 21 = 1386 cm²
b) Keliling = 2 π r = 2 × 3.14 × 5 × 0.5 = 1.57cm
Luas = π r² = 3.14 × 5² × 0.5 = 39.25 cm²
2. keliling = 2 π r = 2 × 22/7 × 7 = 44 cm
Luas = π r² = 22/7 × 7 × 7 = 154 cm²
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1.a) Keliling = 2 π r = 2 × 22/7 × 21 = 132 cm
Luas = π r² = 22/7 × 21 × 21 = 1386 cm²
b) Keliling = 2 π r = 2 × 3.14 × 5 × 0.5 = 1.57cm
Luas = π r² = 3.14 × 5² × 0.5 = 39.25 cm²
2. keliling = 2 π r = 2 × 22/7 × 7 = 44 cm
Luas = π r² = 22/7 × 7 × 7 = 154 cm²