There are no 'diagonals' in a triangle. Each vertex is connected to both of the other vertices, by the sides.
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0 they have no 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.
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.
thank goodness for my math teacher, norm! he said only in an isosceles triangle. The bisector of the vertex angle of an isosceles triangle is perpendicular to the base! =)
it is a right triangle because a rhombus' diagonals are perpendicular