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primary 6 | Maths | Measurement
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G
G

primary 6 chevron_right Maths chevron_right Measurement chevron_right Singapore

Please help and advise
Thank you

Date Posted: 1 month ago
Views: 20
J
J
1 month ago
For the inner perimeter, each ¾ circle has a perimeter of ¾ of the circumference, and two radii

= ¾ x 2πr + 2r
= ¾ x 2π x 9cm + 2 x 9cm
≈ 42.412cm + 18cm
= 60.412 cm

As there are two of them,

60.412cm x 2 = 120.824cm ≈ 120.82cm (2.d.p)

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Kan Ken Yat Rowan
Kan Ken Yat Rowan's answer
7 answers (Tutor Details)
1st
1) Make the white regions into a fraction of circles.
2) Do whatever you can till you are stuck and label them properly/at least something simple for your own understanding.
J
J
1 month ago
Question has no mention of smaller circle being ¾ of bigger circle. Can't assume
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Henry Tan
Henry Tan's answer
343 answers (A Helpful Person)
Hi G, your formula is correct. Radius for inner circle is 9. Diameter of outer circle is 27. Perimeter has to include straight lines. Perimeter is you have to add up all the lines, cannot minus. If the answer ask for 2 decimal places, your working has to be 3 decimal places.
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Henry Tan
Henry Tan's answer
343 answers (A Helpful Person)
Hi G, I had uploaded to YouTube https://youtu.be/hNzn-8pxDXs of the above question . You can learn from there.