hitunglah keliling lingkaran jika diketahui a.jari jari 49m; b.jari jari 21m; c.jari jari 5m; d.jari jari 12m; f.diameter 70cm; g.diameter 2.8cm; h.diameter 15c

maaf tulisan nya jelek harap maklum

A. Jari² = 49 cm
Diameter = 49 × 2 = 98 cm
Keliling = pi × diameter
= 22/7 × 98
= 308 cm

B. Jari² = 21 cm
Diameter = 21 × 2 = 42 cm
Keliling = pi × diameter
= 22/7 × 42 cm
= 132 cm

C. Jari² = 5 cm
Diameter = 5 × 2 = 10 cm
Keliling = pi × diameter
= 3,14 × 10 cm
= 31,4 cm

D. Jari² = 12 cm
Diameter = 12 × 2 = 24 cm
Keliling = pi × diameter
= 3,14 × 24 cm
= 75,36 cm

F. Diameter = 70 cm
Keliling = pi × diameter
= 22/7 × 70 cm
= 220 cm

G. Diameter = 2,8 cm
Keliling = pi × diameter
= 3,14 × 2,8 cm
= 8,792 cm

H. Diameter = 15 cm
Keliling = pi × diameter
= 3,14 × 15 cm
= 47,1 cm

I. Diameter = 50 cm
Keliling = pi × diameter
= 3,14 × 50 cm
= 157 cm

J. Diameter = 2,4 cm
Keliling = pi × diameter
= 3,14 × 2,4 cm
= 7,536 cm

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