| --- |
| source: ncert |
| topic: geometry |
| class_level: class_6 |
| chapter: ch4 |
| difficulty: beginner |
| --- |
| |
| Class 6 | Ch4: Basic Geometrical Ideas |
| Point: exact location, no size. Line: infinite both ways. Line segment: two endpoints. Ray: one endpoint infinite one way. |
| Angles: Acute(0-90), Right(90), Obtuse(90-180), Straight(180), Reflex(180-360), Complete(360). |
| Circle parts: Centre(fixed point), Radius(centre to circle), Diameter(chord through centre=2r), Chord(any two points on circle), Arc(part of circle), Sector(two radii + arc), Segment(chord + arc). |
| One line through two points. Infinite lines through one point. |
| Diameter is a chord but chord is not always diameter. |
