http://www4.boardofstudies.nsw.edu.au/te…
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Well you see that there are two semi circles which mean that you divide the circumference by two.
The formula is:
Pi times diameter
We will be rounding Pi to 3 so what we get will be a little under the real answer.
So the top half circle you can estimate that it is around 3 times 6 divided by two; which is 9.
Add that to the bottom which is around 12 times 3 divided by two which is 18.
So that's 9+18=27, which is close to an answer right? No.
Don't forget to add the 6 meter radius of the bigger semi-circle because perimeter is the entire distance around a figure... Oops...
(I made that mistake too at first glance)
Hope this helps!
The formula is:
Pi times diameter
We will be rounding Pi to 3 so what we get will be a little under the real answer.
So the top half circle you can estimate that it is around 3 times 6 divided by two; which is 9.
Add that to the bottom which is around 12 times 3 divided by two which is 18.
So that's 9+18=27, which is close to an answer right? No.
Don't forget to add the 6 meter radius of the bigger semi-circle because perimeter is the entire distance around a figure... Oops...
(I made that mistake too at first glance)
Hope this helps!