JHS3 Mathematics · Term 2, Week 11
Shapes and Space
Lesson notes
Learning Objectives
Indicator: B9.3.1.1.2 - Identify similar and congruent triangles and use the knowledge to solve related problems
By the end of the lesson, learners can:
- State the conditions for two triangles to be similar (corresponding angles equal, corresponding sides in proportion).
- State the conditions for two triangles to be congruent (corresponding sides and angles exactly equal).
- Identify similar and congruent triangles in given diagrams by comparing angles and side lengths.
- Solve for missing angles in similar and congruent triangles using the properties of corresponding angles.
- Solve for missing side lengths in similar triangles using proportional reasoning.
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Sign in with phone numberCurriculum 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
- B9.3.1.1.2 - Identify similar and congruent triangles and use the knowledge to solve related problems
- Suggested placement
-
Term 2, Week 11
(Week 23 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. 198
Transcribed from the official NaCCA publication. Check this page against the source.
Exemplars (from the NaCCA curriculum)
E.g.1. Recognise similar triangles and solve for the values of the indicated angles in the diagram below:
E.g.2. Recognise congruent triangles and solve for the values of the indicated angles in the diagram below:
E.g. 3. Determine the value of x (using knowledge in similarity and congruency).
