Front-to-back length ratio of herringbone roof

The ratio of herringbone roof is generally 1: 1, starting from the middle of the house and spreading to both sides on average. Practice: divide water on both sides. For example, the roof divided by water in Example 5 is the front cornice wall, and the side length from the back cornice is (for example, 2 feet long, the center point is 1 foot, 1 foot ×0.5 25 feet. The slope is 5 feet. Set a 5-foot column in the center and draw diagonal lines on both sides. It's a herringbone roof