Builds on: PGM1
Recognise a plane shape and its sides and vertices, use the closed-and-straight-sided test to spot a polygon, name polygons from triangle to decagon, and tell regular from irregular.
Classify a triangle by its sides (equilateral, isosceles, scalene) and by its angles (acute, right, obtuse), use equal sides facing equal angles to find a missing base angle, and give a triangle both names at once.
Name the six special quadrilaterals (square, rectangle, parallelogram, rhombus, trapezium, kite) and describe each by its sides, angles and parallel pairs, then identify a quadrilateral from property clues.
Identify and name the lines of a circle (centre, radius, diameter, chord, circumference) and its regions (arc, sector, segment, semicircle), and use diameter = 2 x radius to find one from the other.
Explain a line of symmetry as a fold/mirror line, then count the lines of symmetry of triangles, the special quadrilaterals, the circle, and capital letters, and compare shapes by how many they have.
Unit code GM12
GM12
Identify, name, and describe common plane shapes — triangles (by side and by angle), the special quadrilaterals, and circles — including their sides, angles, and lines of symmetry.
