Tentukan keliling lingkaran berikut ini A.diameter 300cm B.diameter 160cm C.jari jari 50cm D.jari jari 25cm

LINGKARAN

K = phi × d
K = 2 × phi × r

A. K = 300 × 3,14 = 942 cm
B. K = 3,14 × 160 = 502,4 cm
C. K = 2×3,14×50 = 314 cm
D. K = 2×3,14×25 = 157 cm

A .
D = 300 cm
K = π × d
K = 3,14 × 300
K = 942 cm

B.
D = 160 cm
K = 3,14 × 160
K = 502,4 cm

C.
J = 50 cm
D = 50 × 2 = 100 cm
K = 3,14 × 100
K = 314 cm

D.
J = 25 cm
D = 25 × 2 = 50 cm
K = 3,14 × 50
K = 157 cm