It is: 172 cm = 1.72 metres
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There are exactly 30.48cm per 1ft. You can now do a simple conversion. (172cm) x (1ft/30.48cm) = 5.643cm.ft/cm = 5.64ft
r = d/2 = 3.7cm. 4xpi x r^2 is 172cm^2
kilometers
There are 1000 meters in a kilometer. That is what the prefix "kilo" means. 0.3 times 1000 meters is 300 meters. 300 meters minus 60 meters is 240 meters.
30 square meters.