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Dit : a. keliling =....?
b. Luas =....?
Peny:
K = × d
= 22/7 × 42
= 132 cm
jadi, keliling lingkaran tsb adalah 132 cm
L = × r²
= 22/7 × 21²
= 22/7 × 21 × 21
= 22/7 × 441
= 1.386 cm²
jadi, luasa lingkaran tsb adalah 1.386 cm²
sekian dan terima kasih.....^_^