The figure below is made up of five identical rectangles. If the toal area of the figure is 540 square cm, find the perimeter of one rectangle. 
Solution
Area of 1 rectangle ----- 540 square cm divided by 5 = 108 square cm
Length of rectangle is 3 times breadth rectangle, therefore, we can divide 1 rectangle into 3 equal parts as shown above.
The area of 1 square above ----- 108 square cm divided by 3 = 36 square cm
The side of this 1 unit square has to be 6 cm (6 x 6 = 36)
Since 1 side of the square is 6 cm, the length of 1 rectangle is -----
6 cm x 3 = 18 cm
The perimeter of 1 rectangle is therefore,
18 cm + 6 cm + 18 cm + 6 cm = 48 cm
Answer: The perimeter of one rectangle is 48 cm.
Tuesday, March 11, 2008
Red Swastika School P5 CA1 2008 Math Paper 2 (Q15)
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2 comments:
How on earth u all get my school's
exam paper? tis paper is the 1 i almost failed last year...
booklet B is a real hard 1..
How is it so sure that 1 rectangle divide into 3 equal parts will sure get a square?
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