Objectives:


Support:

  • Recognise reflection symmetry.
  • Recognise where a shape will be after reflection.
  • Recognise where a shape will be after a translation.
  • Calculate angles on a straight line.
  • Calculate angles in a triangle or around a point.
  • Use a protractor to measure and draw acute and obtuse angles to the nearest degree.

Core:

  • Begin to identify and use angle, side and symmetry properties of triangles and quadrilaterals; solve geometrical problems involving these properties, using step-by-step deduction and explaining reasoning with diagrams and text.
  • Use 2-D representations to visualise 3-D shapes and deduce some of their properties.
  • Use a ruler and protractor to:
    • measure and draw lines to nearest millimetre and angles, including reflex angles, to the nearest degree;
    • construct a triangle given two sides and the included angle (SAS) or two angles and the included side (ASA);
  • explore these constructions using ICT.

Extension:

  • Solve geometrical problems using side and angle properties of equilateral, isosceles and right-angled triangles and special quadrilaterals.
  • Use straight edge and compasses to construct:
    • the mid-point and perpendicular bisector of a line segment;
    • the bisector of an angle;
    • a triangle given three sides (SSS).

Key Vocabulary:

  • angle, degree (º), estimate, construct, measure, protractor, acute angle, obtuse angle, reflex angle, SAS, ASA, triangle (ΔABC).
  • shape, 2-D, 3-D, triangle, quadrilateral, concave, convex, diagonal, parallel, perpendicular, adjacent, opposite, equal, face, edge, vertex, vertices, isometric, base.

Suggested Lesson Outcomes:


SUPPORT CORE

Framework:








Teaching & Learning Resources:


3D Shapes Resources
Angle Rules Resources
Construction Resources
Constructing Triangles Resources
Measuring Angles Resources
Loci Resurces