There is no such unit of measurement as a diameter, a diameter is the length across something. Perhaps you are thinking of a decimetre.
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15 minutes(.30 meters / minutes) = 4.5 meters
Pi (3.1415)
Diameters cannot be found from that linear measurement. A diameter is the length across the center of the circle. It can also be found by doubling the radius of a circle.
Think of 900 square feet as a square that is 30 feet by 30 feet. 1 foot is the same as about 0.3 meters, so 30 feet is 0.3x30=9 meters. So a square that is 9 meters by 9 meters is 81 square meters.
If each side of a square is 7.5 meters then its perimeter is 30 meters