The number of diagonals of a triangle is
0
1
2
3
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A diagonal is a line segment joining two non-adjacent vertices of a polygon. In a triangle, every pair of vertices is adjacent, so there are no diagonals.
Hence, option 1 is the correct option.
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The minimum number of points of intersection of three lines drawn in a plane is
In the given figure, the number of line segments is
5
10
12
15
In a polygon with 5 sides, the number of diagonals is
4
