Generally speaking, a 6-inch cake refers to a cake with a circular diameter of 6 inches. One inch =2.54 cm. So 6 inches, that is, 6*2.54 cm = 15.24 cm.
Cake is an ancient western pastry, which is usually made in an oven. Cake is made of eggs, sugar and wheat flour as the main raw materials. Milk, fruit juice, milk powder, fragrant powder, salad oil, water, shortening and baking powder are used as auxiliary materials. After stirring, concocting and baking, it is made into a sponge-like snack.
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The origin of birthday cake
Europeans in the Middle Ages believed that birthdays were the day when the soul was most easily invaded by demons, so on birthdays, relatives and friends would gather around to give blessings and send cakes to bring good luck to drive away demons.
Birthday cake, originally only the king was entitled to own, can buy a beautiful cake on his birthday and enjoy the blessings given by everyone.
Baidu encyclopedia -6-inch Qifeng cake