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
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.
two if the triangle has a right angle
7
None
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
Two.
none
1