ちょっけい直径chokkeiちょっけい直経chokkei
1.
A line segment that passes through the center of a circle or sphere, connecting two points on its boundary, representing the longest distance across the shape.
2.
The measurement of this line segment, indicating how wide the circle, sphere, or similar geometric figure is, often used in practical contexts like describing the thickness of a tree trunk or the size of circular objects.
Example:
その穴は直径二メートルです。