Answer:
Yes it forms a right angle triangle.
42 inches of wire will cost 168 cents
Look at the pic to see how to set up the proportion.
There are many possibilities. An example is .
Let us draw a picture to make the things more clear.
Attached is the image.
We have been given that
Therefore, we have
Now, in triangle bcd, we have
Now, in triangle acb, we have
Thus, ad is 15 cm.