Isosceles and Equilateral Triangles
Yes, there can be oblique lines in a triangle. However, there can only be oblique lines in a triangle if the triangle is considered to be a 'right' triangle.
There are no parallel lines in a triangle.
intersection of the lines drawn perpendicular to each side of the triangle through its midpoint
There are no parallel lines in a triangle !
The Right Triangle. Perpendicular lines make a right angle.
There are 0 parallel lines that a triangle has.
All three lines of a triangle are equal.
a scalene triangle has no lines of symmetry
An isosceles triangle has 1 line of symmetry, an equilateral triangle has 3 and a scalene triangle has no lines of symmetry.
No parallel lines but a right angle triangle has perpendicular lines.
If the shape has three straight lines and no other lines then it has to be a triangle