hitunglah keliling dan luas lingkaran jika diketahui panjang jari jari a.4cm b.6cm c.7cm

A. Kll = 2 × 3,14 × 4 = 25,12 cm
Luas = 3,14 × 4^2 = 50,24 cm^2

B. Kll = 2 × 3,14 × 6 = 37,68 cm
Luas = 3,14 × 6^2 = 113,04 cm^2

C. Kll = 2 × 22/7 × 7 = 44cm
Luas = 22/7 × 7 × 7 = 154cm^2

a.4cm
K=2 × Π × r
K=2 × 3,14 × 4
K=25,12 cm
L=Π×r×r
L=3,14×4×4
L=50,24 cm²

b.6cm
K=2×Π×r
K=2×3,14× 6
K=37,68 cm
L=Π×r×r
L=3,14×6×6
L=113,04 cm²

c.7cm
K=2×Π×r
K=2ײ²/7×7
K=44 cm
L=Π×r×r
L=²²/7×7×7
L=154 cm²