0.45 meters
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centimeters
The idea is to multiply the diameter by pi.
0.2025 square meter (if the tile is square).
To figure out how long a revolution is you need to find the circumference of the wheel. If the diameter is 70 centimeters, then to get the circumference you multiply the diameter by pi (3.14). That equals 219.8. centimeters. Then you convert 66 meters into centimeters, and that is 6600. Then you divide 6600 by 219.8 and get 30 revolutions.
The radius of a circle is half the length of the diameter, so if the diameter is 32 centimeters the radius is 16 centimeters.