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D = 21
Dit : L
Jawab :
L = Π × D
L = 22/7 × 21
L = 66 cm²
= pi X r X r
=3,14 X 10,5 X 10,5
=346,185 cm²
KETERANGAN:
r=radius/jari jari. jari jari adalah setengahnya dari diameter.
pi= 22/7. atau. 3,14