Copy of Sections of Cylinders

Drag the blue points to see the different sections of the cylinder.
Anthony Or. GeoGebra Institute of Hong Kong
If the blue plane intersects the cylinder horizontally (parallel to the base), what 2D shape is formed?
If the blue plane intersects the cylinder vertically (perpendicular to the base), what 2D shape is formed?
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Information: Copy of Sections of Cylinders