Answer:
56.55
Step-by-step explanation:
2*3.14*9^2
Triangle (3 sides) 5 9 6
Rectangle (4 sides) 6 12 8
Pentagon (5 sides) 7 15 10
Hexagon (6 sides) 8 18 12
b) 300 edges and 200 vertices
Na+ and Cl- should be examples of an ion.
<Hope I answered your question>
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2+7895 hfcygshcrnagdjdhxr
