A circle with a straight line through it, usually at an angle, and often with a small dot where the centre of the circle would be (also on the line, to clarify that the line does go through the centre).
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The cord of a circle that contains the center of that circle is a diameter of that circle.
You do a diameter circle!!
The ratio of circumference to the diameter of a circle is 3.14159 ... This value is called "Pi" and is represented by the Greek letter π.
Since the area of a circle can be represented by the equation A=πr², to find the are of a circle you merely need to fill in the variables. The radius is half of the diameter, so a circle with a diameter of 4.4 cm has a radius of 2.2 cm. A=π(2.2)². First, square 2.2 and you will get 4.84. Then, multiply 4.84 by pi and you will get approximately 15.2. The area of a circle with a diameter of 4.4 cm is approximately 15.2 square cm.
A circle with a diameter of 28 is a circle.