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## Question

primary 6 | Maths
| Ratio

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Length of rectangle = 2 units + 17 cm

Breadth of rectangle = 2 units + 3 cm

Difference = 14 cm

Since length : breadth = 12 : 5 with a difference of 7,

7 ratio units (not the same as the radius units which I introduced earlier) --> 14

1 ratio unit --> 2

12 ratio units --> 24

5 ratio units --> 10

So the length of the rectangle is 24 cm and the breadth of the rectangle is 10 cm.

2 units + 3 cm --> 10 cm

2 units --> 7 cm

1 unit --> 3.5 cm

= 4 x curved part of the quadrants + 2 x 17 + 2 x 3

= (a full circumference of a circle with radius 3.5 cm) + 34 + 6

= 2 x 3.14 x 3.5 + 40

= 21.98 + 40

= 61.98 cm

### See 1 Answer

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With the answer to part a, you should be able to do part b! :)