The giant sequoia trees in California are famous for their immense size and old age. Some of the trees are more than $2500$ years old, and tourists and naturalists often visit to admire their size and beauty. In some cases, you can even drive a car through the base of a tree!

One of these giant sequoia trees, the General Sherman tree in Sequoia National Park, is the largest living thing on Earth. The tree is so gigantic, in fact, that the base has a circumference of $102.6$ feet! Assuming that the base of the tree is circular, how wide is the base of the tree? That is, what is its diameter?