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2 cards from this section. Quick, good the night before a test.
How many diagonals does a square have?
A square has 4 vertices; apply the diagonal formula.
Is it possible for a triangle to have any diagonals? Why?
Think about how many vertices triangles have.
How many diagonals can a pentagon have?
Apply the diagonal formula.
True or False: A triangle has diagonals.
Think about how a triangle is formed.
If a polygon has 16 sides, how many diagonals does it have?
Plug in n = 16 into the diagonal formula.
Given a polygon with an unknown number of sides and 30 diagonals, determine the number of sides.
Rearranging the formula may help to isolate 'n'.
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