how does one find the centre of a circle.?

Answer 1

measure the diameter then divide by 2 to get the radius. the radius from any edge will be the center

Answer 2

And now, in plain English and words of one syllable (or thereabouts!). If you don't have a pair of compasses (not "a compass", that's for determining which direction is magnetic north, illiterates!), then you won't be able to find the centre accurately. If you do have a pair of compasses, then what you have to do is:

(1) Set them to any width smaller than the circle's diameter (but not too small, or you'll lose accuracy)
(2) Put the point of the compass on the circumference of your circle, and draw a short arc which crosses the circumference.
(3) Move the point to the opposite side of that arc, and draw another arc which crosses the first arc both inside and outside the circumference
(4) Use a ruler to connect the points where the short arcs cross each other.

That line will go through the centre of the circle

(5) Repeat steps 1–4 at another point on the circumference.

The point where the two straight lines cross should be the centre of the circle, but you can confirm this by repeating steps1–4 a second time—all three lines should intersect at the centre of the circle. If they don't, you've cocked it up somewhere!

Have fun.

Answer 3

You don't need compasses, pins, or string at all!

Just take a piece of paper and place one corner on the circle. Then mark the two places where the edges of the paper cross the circle with a pencil. Connect these 2 points and they will form a diameter of the circle.

Then move the paper to put the corner on one end of the diameter you just drew. Once again, mark the two places where the edges of the paper cross the circle. Connect these 2 points to form a second diameter.

Where the two diameters cross is the center of the circle.

Answer 4

All you need to do is find the diameter of the circle (line across the circle) and then half it
OR
you can fold the circle in half and then again. Open up the circle and it will show the centre.

Answer 5

Tie a piece of string to a pencil (that's assuming you don't have a compas) and put it approximately in the centre of the circle. Tug the string and with your finger follow the outline of the circle as you move the string around the pencil in the middle. If it is a perfect fit, you're probably at the centre. otherwise you could try folding it in half and then in half again and the point of the triangle is the centre? Maybe drawing two lines crossing at exactly 90degrees on the circle, hopefully half way both vertically and diagonally, and the cross point is the centre? I don't know!

Answer 6

THe center of a circle is at point of 1/2 the diameter.

Answer 7

Draw a stright lina across the circle, then draw another perpendicular line to the first one. The junction of the two line should lie on the circle. Now connect puncts where lines cross the circle. The middle of the section is the middle of the circle :)

Answer 8

Bisect 2 x arcs of a circle, where they meet is the centre

Answer 9

Sorry for my poor English.
Choose a point A and a point B on the circle and draw the line AB. Now draw a line l that is perpendicular on AB and bisects it.
Choose a point C and a point D on the circle and draw the line CD. Now draw a line m that is perpendicular on CD and bisects it. The place where l and m cross is the center of the circle.

Answer 10

Take half the diameter, the longest distance betweeen 2 points in a circle.

Answer 11

The diameter is the longest chord of the circle. draw two diameters and where they cross is the centre.