None.
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.
two if the triangle has a right angle
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.
Two
none
An obtuse triangle can have at most one perpendicular line, which is the altitude from the vertex of the obtuse angle to the opposite side. This altitude is perpendicular to the base, creating a right angle. However, the other two angles in the triangle are acute, and thus do not form additional perpendicular lines within the triangle itself.
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.
A right angle triangle has a pair of perpendicular lines that meet each other at 90 degrees.
3 lines * * * * * None if it is acute angled scalene One if it is acute angled isosceles and Three if it is equilateral.
7
None
two if the triangle has a right angle
There are no parallel lines in any triangle but a right angle triangle has perpendicular line that meet each other at 90 degrees.
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.
Two.
none
Two