Read the passage below. When building a log cabin, it is necessary to use joists and framers of the proper size. To calculate the perimeter of a log, simply multiply the diameter of the circle by pi. It is sometimes necessary to measure the face of the log. In those cases, you will need to find the radius by dividing the diameter in half. Then square the radius and multiply it by pi. “Joists,” “framers,” and “face” are examples of