A nine-inch pizza is enough for several people.

The size of pizza is inches, 1 inch (in)=2.54 cm, and seven inches means seven inches in diameter, that is, 17.78cm.

The diameter of a 7-inch pizza is 17.78 cm, as shown below:

9 inches is 22.86 cm, the pizza with 10 inch is 25.4 cm in diameter, and the pizza with 12 inch is 30.48 cm in diameter. The following picture shows the comparison of seven inches, ten inches and twelve inches:

Extended data:

9-inch pizza, recommended 1-2 people. 12 inch pizza, recommended for 2-3 people. 14 inch pizza, recommended for 3-4 people.

References:

Pizza (gourmet) _ Baidu Encyclopedia

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