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JSS3: MATHEMATICS - 2ND TERM

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  1. Trigonometry I | Week 1
    3 Topics
    |
    1 Quiz
  2. Trigonometry II | Week 2
    4 Topics
    |
    1 Quiz
  3. Trigonometry III | Week 3
    5 Topics
    |
    2 Quizzes
  4. Similarity I | Week 4
    3 Topics
    |
    1 Quiz
  5. Similarity II | Week 5
    3 Topics
    |
    1 Quiz
  6. Similarity III | Week 6
    2 Topics
    |
    1 Quiz
  7. Similarity IV | Week 7
    2 Topics
    |
    1 Quiz
  8. Variation I | Week 8
    3 Topics
    |
    1 Quiz
  9. Variation II | Week 9
    2 Topics
    |
    1 Quiz
  10. Calculations Involving Standard Form | Week 10
    4 Topics
    |
    1 Quiz
  11. Compound Interest | Week 11
    4 Topics
    |
    1 Quiz



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Topic Content:

  • Finding Scale Factor

To find a scale factor of an enlargement, you require two corresponding sides. 

The scale factor of an enlargement is the ratio of the length of a side on a shape to the corresponding length on the other shape.  

Scale factor = \( \frac{length\:on\:enlargement}{corresponding\:length\:on\:original} \)

  • Scale factor bigger than 1 → it is an enlargement
  • Scale factor smaller than 1 → it is a reduction

Example 5.2.1:

If triangles ABC and XYZ are similar find the scale factor.

Screenshot 2023 12 14 at 05.56.04

If triangles ABC and XYZ are similar then:

\( \frac{AB}{XY} = \frac{BC}{YZ} = \frac{AC}{XZ} \)

Or

\( \frac{XY}{AB} = \frac{YZ}{BC} = \frac{XZ}{AC} \)

 

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