How do the arrows for +1 and -1 show both distance and direction?
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So the equation for the area of a circle is 
First to find the radius, you would need to divide the diameter, 26, by half, which in this case its 13.
Replace the r variable with 13 and solve:
First to find the radius, you would need to divide the diameter, 26, by half, which in this case its 13.
Replace the r variable with 13 and solve: