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JSS1: MATHEMATICS - 2ND TERM

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  1. Algebraic Processes | Week 1
    4 Topics
    |
    1 Quiz
  2. Simplification of Algebraic Expressions | Week 2
    4 Topics
    |
    1 Quiz
  3. Simplification of Algebraic Expressions 2 (Use of Brackets) | Week 3
    4 Topics
    |
    1 Quiz
  4. Simple Equations | Week 4
    1 Topic
    |
    1 Quiz
  5. Simple Equations II | Week 5
    3 Topics
    |
    1 Quiz
  6. Plane Shapes I | Week 6
    5 Topics
    |
    2 Quizzes
  7. Plane Shapes II | Week 7
    7 Topics
    |
    1 Quiz
  8. Plane Shapes III | Week 8
    7 Topics
    |
    1 Quiz
  9. Decimal and Percentages I | Week 9
    2 Topics
    |
    1 Quiz
  10. Decimal and Percentages | Week 10
    3 Topics
    |
    1 Quiz



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CONSTRUCTION121

Perimeter  =  2a  +  2b

= 2 (a  +  b)

Example 1: 

A parallelogram has sides measuring 20cm by 25cm. What is the Perimeter?

Solution

CONSTRUCTION122

a = 20cm

b = 25cm

Perimeter = 2 (a  +  b)

Perimeter  = 2(20  +  25)

= 2(45)

= 2 × 45

= 90cm

Example 2:

A parallelogram has sides measuring 250mm by 200mm. What would be the length of the side of a square having the same perimeter?

 

Solution:

perimeter of a parallelogram 2

Length of the parallelogram   =   250mm

Breadth/Width of the parallelogram   = 200mm

Perimeter p = 2 (a   + b)

P =   2 (250 + 200)

P =   2(450)

P = 900 mm

Therefore the perimeter of the square =  900 mm (i.e. the same as the perimeter of the parallelogram).

But the perimeter of a square is

P =   4 × length 

i.e.  900 =  4 × length

Divide both sides by 4

\( \frac{900}{4} = \frac{4 \: \times \: length}{4} \)

Length  = \( \frac{900}{4}\)

Length = 225m

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