Properties of 2D Shapes

Scheme of work: GCSE Foundation: Year 9: Term 1: Properties of 2D Shapes

Distinguish between regular and irregular polygons based on reasoning about equal sides and angles.
know angles are measured in degrees: estimate and compare acute, obtuse and reflex angles
draw 2-D shapes using given dimensions and angles

Use conventional terms and notations: points, lines, vertices, edges, planes, parallel lines, perpendicular lines, right angles, polygons, regular polygons and polygons with reflection and/or rotation symmetries; use the standard conventions for labelling and referring to the sides and angles of triangles; draw diagrams from the written description
derive and apply the properties and definitions of: special types of quadrilaterals, including square, rectangle, parallelogram, trapezium, kite and rhombus; and triangles and other plane figures using appropriate language
identify and apply circle definitions and properties, including: centre, radius, chord, diameter, circumference, tangent, arc, sector and segment

Understanding and using the vocabulary is key throughout this topic.
Regular polygons are closed shapes with straight lines of equal length.
Students need to recognise different types of quadrilaterals and triangles by their geometrical properties.
All shapes have a rotational symmetry of at least one.
Reflected vertices are an equal distance from the line of symmetry.