JHS1 Mathematics · Term 2 Week 9: Shape and Space

Lesson notes

Learning Objectives

Indicator: B7.3.1.1.2 - Apply the fact that (i) complementary angles are two angles that have a sum of 90°, and (ii) supplementary angles are two angles that have a sum of 180° to solve problems.

By the end of the lesson, learners can:

Define complementary angles as two angles whose measures sum to 90° and supplementary angles as two angles whose measures sum to 180°.
Identify whether a given pair of angles is complementary, supplementary, or neither, by calculating their sum.
Determine the measure of a missing angle when given one angle of a complementary or supplementary pair.
Solve simple word problems involving complementary and supplementary angles in practical situations.
Use the relationship between complementary and supplementary angles to check the reasonableness of their answers.

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Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: Shape and Space (3.1)
Content standard: B7.3.1.1 - Demonstrate understanding of angles including adjacent, vertically opposite, complementary, supplementary and use them to solve problems.
Indicator: B7.3.1.1.2 - Apply the fact that (i) complementary angles are two angles that have a sum of 90°, and (ii) supplementary angles are two angles that have a sum of 180° to solve problems.
Suggested placement: Term 2, Week 9 (Week 21 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. 48
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

Figure from the jhs1 mathematics curriculum, printed page 48

E.g.1 Determine the missing angle E.g.2 Determine the missing angle marked x. marked x.