If the area of a circle is 36 pi, what is it's circumference?

Write the converse of the following statement: if the trees have no leaves, then it is fall. if the trees have no leaves, then it is fall. the trees have no leaves, therefore it is fall. it is fall since the trees have no leaves. if it is fall, then the trees have no leaves.

Need on this one asap im almost done with this subject

Which of the following are accepted without proof in a logical system? check all that apply.