Basic geometrical ideas (2-D)

This CTET Paper 2 chapter builds Basic Geometrical Ideas (2-D) for future Classes VI-VIII maths teachers: point, line, line segment, ray, open and closed curves, angles and their naming, triangles, quadrilaterals, circles with centre, radius, diameter, chord, arc, sector and segment, intersecting versus parallel lines, and classroom pedagogy for ray-versus-segment and angle-naming traps with TLM such as geoboard and chalk. Sibling topics Elementary Shapes and the full Geometry chapter stay one-line contrasts only.