A triangle must have straight lines.
If the lines are straight then it IS a triangle.
There are three straight edges in a triangle.
None. Mathematically impossible..
There are no parallel lines in a triangle !
Straight lines.
An isosceles triangle consist of 3 straight lines 2 of which are equal in length
A triangle must have straight lines.
If the shape has three straight lines and no other lines then it has to be a triangle
All triangles - equilateral or not - have three straight sides.
Straight ones... Not truly lines, but segments
If the lines are straight then it IS a triangle.
no?
#1~ One VERTICAL line straight in the middle of the Equilateral Triangle.
three linestwo slanting lines and a straight line
There are three straight edges in a triangle.
A 'side' of a triangle is any one of the three straight lines used to draw it.