== == An isosceles triangle with sides 5, 5, 3. The only line of symmetry is the line joining the midpoint of the side of 3 units to its opposite vertex.
2D shape
A 2D shape with 9 sides is called a Nonagon.
Hexagon
A pentagon
Octagon
The 2D shape which has one line of symmetry is the trapezium.
a line
It doesn't have any volume (3D) and it's not a line (1D). Thus, it is a 2D shape.
2D shape
A 2D shape with 9 sides is called a Nonagon.
Octagon
2D shapes include squares, triangles, rectangles and circles.
1D a single line (?) 2D a flat shape 3D a cube
Square
Tetradecagon.
hexagon
A pentagon