Parts of a Circle
Discover the Parts of a Circle!
Use the drop-down list and the appearing check boxes and sliders to discover the parts of a circle.
Drag the points to explore different configurations.
A chord is a segment joining two points on the circle. What is the name of the longest chord in a circle? Can you relate its length to the length of the radius?
The endpoints of a diameter split the circle in two arcs. What is the name of these arcs? What is the relationship between the two of them?
If you draw two radii of a circle, what is the name of the region enclosed by these two radii and the corresponding arc? Is there only one such region, or more than one? Draw your conclusions on paper, or create a GeoGebra construction showing your answer.