Shelly's Sporting Shoppe

Topic: Plane Geometry
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The owner of Shelly’s Sporting Shoppe has decided to hold a contest in his store and asks his employee to invite 7 people who visit his store to try the challenge. When only 3 of the 7 show up, they have to try to solve this problem using math.

Problem: How many diagonals are in a convex heptagon?

Common Core Standards: 4.G.2
Problem #: 
32 (2017-2018)
Problem Difficulty Level: 2 [?]