Symmetry
- Recalling reflection symmetry
- Idea of rotational symmetry, observations of rotational symmetry of 2-D objects. (90°, 120°, 180°)
Representing 3-D in 2-D
- Identification and counting of vertices, edges, faces, nets (for cubes cuboids, and cylinders, cones).
- Mapping the space around approximately through visual estimation.
Congruence
- Congruence through superimposition
- Extend congruence to simple geometrical shapes e.g. triangles, circles.
- Criteria of congruence
Construction
- Construction of a line parallel to a given line from a point outside it
- Construction of simple triangles.
Theme 5: Mensuration
Revision of perimeter and Idea of Circumference of Circle Area
Concept of measurement using a basic unit area of a square, rectangle, triangle, parallelogram and circle, rings and combined figures.
Theme 6: Data Handling
- Collection and organization of data – choosing the data to collect for a hypothesis testing
- Mean, median and mode of ungrouped data – understanding what they represent
- Constructing and interpreting bar graphs
- Feel of probability using data through experiments. Notion of chance in events like tossing coins, dice etc.
- Tabulating and counting occurrences of 1 through 6 in a number of throws.
- Comparing the observation with that for a coin. Observing strings of throws, notion of randomness.