Counting circles?

Question

Can anyone please educate me on circles..

Answer 1

That's a big question because there's a lot to learn about circles.

The definition of a circle is that it is the locus of all points that sre equidistant for a given point called the center of the circle. If you draw a straight line from the center of the circle to any point on the circle, the distance, called the radius. is always the same. We say that all radii of the same circle are equal. (radii is the plural of radius).

If you draw a straight line from any point on the circle through the center of the circle and continue the line until it reaches the other side of the circle, you will have what is called the diameter of the circle.

The distance around a circle is called the circumference of the circle. For all circles, it is true that the Circumference divided by the diameter is always equal to the same value called pi. Pi is approximately equal to 3.14196. It is a number that is never exact, but can be calculated to as many decimal places as you would like.

The Circumference of a circle is (pi)(diameter) or (2pi)(radius).
The Area of a circle is (pi)(radius)^2

A circle is divided into 360 degrees. If the second hand on an analog watch makes on complete revolution around the clock face, it has traveled through 360 degrees. The circle is further divided into minutes where 60 minutes = 1 degree and minutes are divided into seconds where 1 minute = 60 seconds.

To go further in the explanation of circles and all of their properties would be inappropriate at this time.

Answer 2

ARea=Pi * (Radius ^2)
Diameter=2 * Radius
Radius = distance from center of circle to edge
Diameter = distance from edge to edge, running through the center of the circle
Circumference = Pi * Diameter = 2 * Pi *Radius
Circumference = distance around the circle