A diameter is a line connecting any two points in a circle that passes through the centre of a circle.
You can draw 1 diameter and divide the circle in half. You can draw 2 and divide it into 4 pieces or draw an infinite amount and divide it into infinite pieces.
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Divide the diameter by 2.
That depends on what you know. If you know the radius of the circle, double it to get the diameter. If you know the circumference of the circle, divide it by π to get the diameter. If you know the area of the circle, find its square root and divide the result by π to get the radius then multiply by 2 to get the diameter.
3 eighths or 0.375
Divide the circumference by pi (about 3.1416). The result is the circle's diameter.
Divide the circumference by pi (3.14159) to get the diameter.