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Question
primary 6 | Maths
| Geometry
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Pls help
Date Posted: 4 years ago
Views: 350
first, do "cut and paste" to see if you can re-arrange the shape to another shape that is easier to calculate.
by cutting the top half of the figure into 2 quarter circles, and rearranging them at the bottom (like jigsaw puzzle), you can get a 70 cm by 35 cm rectangle which is much easier to calculate area.
note that the answer for area does not involve pi at all.
for perimeter, same idea, use a bit of cut and paste, the perimeter is equivalent to one full circle (this answer involves pi).
by cutting the top half of the figure into 2 quarter circles, and rearranging them at the bottom (like jigsaw puzzle), you can get a 70 cm by 35 cm rectangle which is much easier to calculate area.
note that the answer for area does not involve pi at all.
for perimeter, same idea, use a bit of cut and paste, the perimeter is equivalent to one full circle (this answer involves pi).
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Date Posted:
4 years ago
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