Hi! I just wanted to say hello and ask this question for easy points! 5-1=?
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The circumference of a circle - 
The radius is 10 in.
The radius is 10 in.
The length is 10.
Since the two points share the same y-coordinate, the segment rt is horizontal.
This means that the length of the side is simply the difference (in absolute value) between the x coordinates of the two points.
So, we have