-- Every multiple of 3 could be a perimeter. There are an infinite number of those.
-- And for each one, there are an infinite number of different triangles that all have
that number for their perimeter.
So I guess the answer is: An infinite number of infinite numbers of them.
810 is divisible by 3. No need to do anything to it.
Add 2.
you would add 8-making the number 550.550 divided by 10 is 55
You can make a perimeter with side lengths if 3, 3, 3, 3 or you could do a rectangle with side lengths of 4, 4, 2, 2. Finally you could do a rectangle with side lengths of 5, 5, 1, 1.
in-
1, 4 or 7
87 is already divisible by 3, so you could add a 0, 3, 6 or 9 anywhere in there and get the same result.
The perimeter around the pool was 68'.
4
The concept of a perimeter does not make sense for a solid object.
If a "1 inch triangle" means a triangle each of whose sides is 1 inch, then there is no answer to the question. These are equilateral triangles and equilateral triangles can tesselate to form a larger equilateral triangle. The fact that the large triangle is equilateral means that its three sides are equal so that its perimeter ie the sum of the three sides must be divisible by 3. 20 is not divisible by 3.
It would help if you could insert the relevant numbers in the copy/paste!