JHS3 Mathematics · Term 2, Week 10

Shapes and Space

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Shapes and Space (3.1)
Content standard: B9.3.1.1 - Apply the properties of angles at a point, angles on a straight line, vertically opposite angles, corresponding, angles to` solve problems.
Indicator: B9.3.1.1.1 - Derive the formula for calculating the sum of angles in any polygon and use this to calculate the value of missing angles in polygons
Suggested placement: Term 2, Week 10 (Week 22 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics, Common Core Programme (JHS1-JHS3), 2023, p. 196
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g.1. Identify and name the various polygons such as a triangle, quadrilaterals, pentagons, and hexagons, etc.

Wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions,... — A wide colour mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, coloured regions. Visible labels, values, and notation include: Equilateral Triangle; Square; Hexagon; Heptagon; Nonagon; Decagon; 10; Pentagon; Octagon; 1; Undecagon.

E.g.2. Derive and use the

Wide black-and-white mathematical teaching visual is organised as a table with horizontal divisions, vertical... — A wide black-and-white mathematical teaching visual is organised as a table with horizontal divisions, vertical divisions, open white space around the main marks. Visible labels, values, and notation include: 99995; 25; 3x-10; *+15.

formula (n - 2) × 180 ° and calculate the value of x (interior and angles of a triangle).

E.g.3. Derive and use the formula (n - 2) × 180 ° and calculate the interior angles of a quadrilateral.
E.g.4. Derive and use the formula (n - 2) × 180 ° and

calculate the interior angles of polygons, pentagons, hexagons, etc.
(i) Find the value of x and the various angles in the hexagon.

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