It is not possible to have a circle with an area of 100 metres. Areas must be measured in square units, such as square metres.
Assuming that the circle had an area of 100 sq metres, its radius would be 5.64 metres (to 2 dp).
Chat with our AI personalities
radius = square root of 100pi/pi = 10 meters
Radius 10, area = 100 pi; radius 9, area = 81 pi
A circle with a radius of 100 units has a circumference of 628.32 units.
Radius = 20/2 = 10 Area of circle = pi x radius x radius = 3.1415 x 10 x 10 = 3.1415 x 100 = 314.15 square units
The area of a circle of radius 12 is 144 pi; the part of the circle defined by such an arc (the arc itself, of course, has an area of 0) is 100/360 of that, which simplifies to 40 pi. To 3 significant digits, that is 126.