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primary 6 | Maths
| Geometry
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= 12 : 5 : (12 - 5)
= 12 : 5 : 7
Length = 17cm + 2 radius
Breadth = 3cm + 2 radius
Difference = 17cm + 2 radius - 3cm - 2 radius
= 17cm - 3cm + 2 radius - 2 radius
= 14cm
So 7 units = 14cm
1 unit = 14cm ÷ 7
= 2cm
= 12 x 2cm
= 24cm
Since length = 17cm + 2 radius,
Then 2 radius = 24cm - 17cm
= 7cm
1 radius = 7cm ÷ 2
= 3.5cm
= 17cm + 17cm + 3cm + 3cm
= 40cm
Combined circumference of 4 quarter circles
= Circumference of 1 whole circle
= 2πr
= 2 x 3.14 x 3.5cm
= 21.98cm
Perimeter of figure
= 21.98cm + 40cm
= 61.98cm
= 62.0cm (1 d.p)
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