The diameter of a 9-inch pizza is 22.86 cm. Pizza originated in Italy in Europe, and the size of pizza is generally named after its diameter. The diameter of an inch pizza is 2.54 cm, so the conversion formula of a 9-inch pizza is 9 times 2.54, which means it is 22.86 cm. The size of pizza is often replaced by the letters "L" and "R", the former refers to large size and the latter refers to regular pizza.

Pizza, also known as pizza, pizza, pizza, pizza, is a kind of food that originated in Italy and is very popular all over the world. The usual practice of pizza is to use fermented round cakes covered with tomato sauce, cheese and other ingredients and baked in an oven.

Cheese is usually mozzarella cheese, but also a mixture of several kinds of cheese, including Parmesan cheese, Roman cheese, Italian country soft cheese or Monterey Jack cheese, mozzarella cheese and so on. Pizza sauce must be made of delicious tomatoes mixed with pure natural spices, which has the characteristics of rich flavor. All fillings must be fresh, and it is recommended to use the best varieties to ensure the quality.

A good pizza must have four characteristics: fresh crust, good cheese, top pizza sauce and fresh stuffing. The bottom of the cake must be made every day. Flour is generally ground with Grade A wheat in spring and winter, so that the bottom of the cake will be crispy on the outside and soft on the inside.