1
The 2 perpendicular sides of a right angle triangle intersect each other at right angles
A triangle can have at most one obtuse angle, but triangles do not necessarily have any obtuse angles.
An obtuse triangle is a triangle that has one angle greater than 90 degrees.
No right triangle can have any obtuse angles inside it.
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.
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
Two.
none
1
It has a pair of perpendicular lines that meet at right angles to form the 90 degree angle of a right angle triangle.