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Perpendicular lines Parallel lines Diagonal lines
angles...
their would be still 2 diagonal lines * * * * * There are 8*(8-3)/2 = 8*5/2 = 20 lines joining two vertices. That being the conventional definition of a diagonal, there are 20 diagonals.
To draw a square with 3 lines, you can draw two perpendicular lines to form a right angle. Then, draw a diagonal line connecting the endpoints of the two perpendicular lines. This diagonal line will complete the square shape with only 3 lines.
65. The equation to figure the number of diagonal lines for any polygon is n(n-3)/2. n= number of vertices
A polygon with n vertices has n*(n-3)/2 diagonals. Therefore, a pentagon, which has 5 vertices, has 5*(5-3)/2 = 5 diagonals.
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