the deck in hope's backyard is round. It has 5 posts evenly spaced around the edges to support a trellis. For her birthday party, shewants to connect each post to all the other posts with crepe-paper streamers.How many streamers will she need?
3 answers
What is the perimeter of the deck? How long are the streamers?
That is all the information they give in the problem..
So your posts would form a pentagon.
The question becomes ....
How many sides and diagonals does a pentagon have?
There are 5 sides, and 5 diagonals (make a sketch to see how)
total streamers = 10
If you know combinations, this would be C(5,2) = 10
The question becomes ....
How many sides and diagonals does a pentagon have?
There are 5 sides, and 5 diagonals (make a sketch to see how)
total streamers = 10
If you know combinations, this would be C(5,2) = 10