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2 answers:
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Angles can be used to estimate the side lengths of a shape.
The letters in order of greatest to least are (a), (b) and (c)
The sum of angles at side (a) is:
The sum of angles at side (c) is:
The sum of angles at side (b) is:
So, we have:
The smaller the base angles, the longer the side.
Hence, the letters in order of greatest to least are (a), (b) and (c)
Read more about angles at:
If there is more to the answer than what I give please ask for more!
With
we can find 
by substituting 4 into the main function.
So it would look like this:
Hope this helps!
With
So it would look like this:
Hope this helps!