0 is the middle number between negative numbers and positive numbers. Since 1/2 is positive, we know that 1/2 is greater than 0.
Circumference = 2 * PI * radius
Circumference = 2 * 3.14159265 * 63
Circumference = 395.841
Step-by-step explanation:
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See Below
First, put them into y = mx + b form. From there you can graph them by identifying their slopes and y-intercepts.