berapakah keliling lingkaran jika jari-jarinya 5 cm.
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Panjang jari-jari adalah . . .
maka diameternya 5 × 2 = 10 cm
Keliling (K) = × d
= 3,14 × 10
= 3140 cm
pi= 22/7
r= jari jari
2 x 22/7 x 5= 31,42
maaf kalau ada yg slh....