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primary 6 | Maths
| Measurement
3 Answers Below
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Date Posted: 5 years ago
Views: 482
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)
= 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)
See 3 Answers
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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.
2) Do whatever you can till you are stuck and label them properly/at least something simple for your own understanding.
Date Posted:
5 years ago
Question has no mention of smaller circle being ¾ of bigger circle. Can't assume
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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.
Date Posted:
5 years ago
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Hi G, I had uploaded to YouTube https://youtu.be/hNzn-8pxDXs of the above question . You can learn from there.
Date Posted:
5 years ago
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