Got pizza?

Team: 
Team Pepperoni Pizza Slices
Topic: Plane Geometry
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Four girls are at a sleepover and decide to order a pizza. When one girl accidentally invites eight other people, what is the diameter of the new pizza needed?

Common Core Standards: 7.G.4
Problem #: 
53 (2014-2015)
Problem Difficulty Level: 4 [?]