0 they have no diagonals
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There are no 'diagonals' in a triangle. Each vertex is connected to both of the other vertices, by the sides.
A trapezium has two diagonals.
There can be only one pair of perpendicular lines in an isosceles triangle when it is a right angled isosceles triangle. A non right angled isosceles triangle has no pairs of perpendicular lines.
In an equilateral triangle: 3 In an isosceles triangle: 1 In a scalene triangle: 0
there is 2 diagonals in a triangle