Isosceles triangles do.
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You cannot make four triangles our of a quadrilateral by ONE line through it. One line can give you at most two triangles. Two lines, each running from one vertex of the quadrilateral to the opposite vertex, will give 4 triangles.
There is no form of reflection that flips one point on a line and leaves the rest of the line unchanged.
Reflection of an object is the flip of that subject on a particular line, that is called line of reflection.
Are you testing us? *gets paper* 9 if you dont count triangles with a line going through it 17 if you count triangles with more than one line going through it e.g all possible triangles visible
Line symmetry is another name for reflection symmetry. One half is a reflection of the other half. The line of symmetry is the line where you could fold the image and have both halves match exactly.