What is the positive angle of the intersection of inclined planes on the inclined top?

The roof of the entrance of Dule Temple has five ridges.

Four slopes, the front and back slopes intersect to form a positive ridge, and the left and right slopes intersect with the front and back slopes to form four vertical ridges, which are only used by the most distinguished buildings in palaces and temples. Sloped roof, also known as sloping roof, refers to the roof with drainage slope generally greater than 3%. Sloped roofs are widely used in buildings, mainly including single slope type, double slope type, four slope type and folding type. Double slope and four slope are widely used. Double-slope roof is called hanging mountain when the end roof protrudes out of the gable. A gable with a flat roof is called a hard mountain. The four corners of the traditional four slopes in China are inclined, which is called Nuo Temple. The main ridge extends and two mountain flower faces are formed on both sides, which is called inclined mountain. The tile line intersects with the sloping roof in the form of pyramid roof, and the treasure roof is often arranged at this point.