Equilateral triangle

1
Equilateral triangle
All sides the same length
2
Isosceles triangle
Two sides the same length, one side different.
3
Scalene triangle
No sides the same length
4
Parallelogram
A squint rectangle.
5
Rhombus
A squint square.
6
Trapezium
One pair of opposite sides the same, the other
opposite pair different lengths.