1 in = 2.54 cm (exactly)
1 ft = 12 in
⇒ 6 ft 9 in = 6 x 12 in + 9 in
= 81 in
= 81 x 2.54 cm
= 205.74 cm
≈ 206 cm
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Radius = circumference/2pi, in this case 69/2pi or 34.5/3.14, as near 11 cm as makes no difference.
If you mean .69 of an hour then it is 41.4 minutes
6
100,000 cm
10 cm