If they share the same centre - they're 'concentric'
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The word perimeter means the distance around the outside of an object. The perimeter of a circle has a special name. We call it the circumference. The perimeter of this circle, or circumference, is 25 ft.
In the case of a circle, it is common to call this "circumference" instead of "perimeter". Just multiply the diameter by pi.
The distance of two points of the circle is called as perimeter. Since these two points are located on the same circle, their peripheral distance is measured.
diameter x pie = circumference remember to call it circumference idk about your teachers but mine are picky answer: 50.26 (rounded)
A. If the line segment touches two points on the circle it is called as: 1. secant; if the line extends outside the circle. 2. chord; if the line is present only within the circle. B. If the line segment touches one point on the circle AND the center of the circle AND is present only within the circle it is called as: radius.