A 50-meter diameter is equivalent to the distance across a circle from one edge to the other passing through the center, measuring 50 meters in length. In terms of area, a circle with a 50-meter diameter would have a radius of 25 meters and an area of approximately 1,963.5 square meters (πr^2). This size can be visualized as a circle with a radius of 25 meters or a little over 82 feet.
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The diameter of a circle is the space between the two sides of the circle. If something is 50 meters in diameter, then it is a circle that is 50 meters between one side and the other side in a straight line.
Twelve inches is a length. It can be a diameter, but if it is a diameter, you would simply say 'The circle is 12 inches diameter'. So; how big is it - it is 12 inches.
To calculate the area of a square piece of land, you multiply the length by the width. In this case, 50m x 50m equals 2500 square meters. Therefore, a 50m x 50m piece of land has an area of 2500 square meters.
Exactly 1 inch!
A wheel is in the shape of a circle. The formula for the circumference of a circle is 2πr where r is the radius. But, the diameter of a circle is twice the radius so this equation can be written, Circumference = πd where d is the diameter. The Circumference is therefore π times as big as the diameter, π = 3.142 or 22/7 approx.
5.6433 ft radius or 11.2866 diameter