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A circle labeled "metal" with a smaller circle labeled "aluminum" completely inside it
The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.
You are describing a railroad crossing sign.
It will represent 1/360 of a circle's circumference of 360 degrees
The director circle of a circle with radius r is a concentric circle with radius r*sqrt(2).