A circular chicken house has an area of 40m². What length of chicken wire is required to fence the house without any wire left over?

Which expression gives the area of the triangle shown below

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?