It's the diameter.
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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.
It is the circumference.
Ah, the distance across the end of a pencil is what we call the diameter. It's the measurement from one side of the pencil to the other side, passing through the center. Just imagine a little circle that fits perfectly on the end of your pencil – that's the diameter!
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.
There's no such thing as the "area of a circumference", no matter how you spell it.A circumference is a length, representing the distance around a circle, and doesn'thave an area.If you know the circumference of a circle, and you call it 'C', then the area of the circle isC2 / (4 pi)