you will need to know the angle subtended by the arc; arc length = radius x angle in radians
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The radius of a circle is any straight line from the centre of the circle to its circumference. The radius can also refer to the length of this line.
you have multiplythe radius by 2 to get the diameter
The answer depends on what information you are given. If you know the circumference, then divide by Pi and that is the diameter. Half of the diameter is the radius. If you don't know anything about the circle, you would need to measure and find the diameter.
The area of a sector of a circle with radius 12 and arc length 10pi is: 188.5 square units.
If yo have the area of the circle, the square is irrelevant. Radius = sqrt(Area/pi)