Two
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two if the triangle has a right angle
Right angle triangle, yup that's right
A right-angle triangle.
Yes, because you can notice that the right angled triangle has one right angle, so its only 1 perpendicular line. Hope this helped :D
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.