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|part of speech:
||in geometry, a straight line passing through the center of a circle or sphere and having its ends on the circumference or surface.
The figure shows the circle's diameter.
||the length of the line that passes through the center of a circle or sphere and has its ends on the circumference or surface
To calculate the area of a circle, you need to know the diameter.
||the width of any approximately circular, spherical, or cylindrical object.
Earth has a diameter of about 8,000 miles, or 13,000 kilometers.