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JSS2: MATHEMATICS - 3RD TERM

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  1. Scale Drawing | Week 1
    3 Topics
    |
    1 Quiz
  2. Angles of Elevation & Depression | Week 2
    3 Topics
    |
    1 Quiz
  3. Pythagoras’ Theorem I | Week 3
    3 Topics
    |
    1 Quiz
  4. Pythagoras’ Theorem II | Week 4
    2 Topics
    |
    1 Quiz
  5. Area and Volume of Cones and Cylinders | Week 5
    3 Topics
    |
    1 Quiz
  6. Cones | Week 6
    3 Topics
    |
    1 Quiz
  7. Bearings and Distances I | Week 7
    2 Topics
    |
    1 Quiz
  8. Bearings and Distances II | Week 8
    2 Topics
    |
    1 Quiz
  9. Presentation of Data | Week 9
    6 Topics
    |
    1 Quiz
  10. Probability | Week 10
    6 Topics
    |
    1 Quiz



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Topic Content:

  • Map Scales

Scale on a map is defined as the ratio of actual distance to distance on the map. 

Map scale = \( \frac {actual \: distance}{distance \: on \: map} \)

Map scales are normally written in the ratio form 1 : 7 e.g. 1 : 50,000 means 1 cm represents 50,000 cm. 

Example 1.3.1:

Rewrite the scales in ratio form 
a. 1 cm represents 10 m 
b. 1 cm represents 20 cm 
c. 1 cm represents 20 km   

Solution: 

a. 1 cm represents 10 m 

both have different units:

change 10 m to cm. 

1 m =  100 cm 

∴ 10 m = 10 × 100 cm = 1000 cm 

∴ 1 cm : 1000 cm

Scale = 1 : 1000

b. 1 cm represents 20 cm 

both are in the same units 

scale = 1 : 20 

c. 1 cm represents 20 km 

convert 20 km to cm 

 

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