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2 cards from this section. Quick, good the night before a test.
Calculate the number of diagonals in a triangle.
Use the formula for n = 3.
How many diagonals does a square have?
Use the formula for n = 4.
How many diagonals does a triangle have?
Think of how many non-adjacent vertices you can connect.
What is the formula for finding diagonals in an n-sided polygon?
Relate to how connections form through vertices.
If you have a 10-sided polygon, verify how many diagonals exist using the formula.
Calculate stepwise to ensure understanding.
Create your own polygon and verify if the formula applies — does it hold for irregular shapes?
Sketch your irregular polygon and analyze the connections.
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