Theory:

In this lesson we learn the summary of the quadrilaterals properties.
 
Quadrilaterals
Opposite sides
 All sides are equalOpposite angles are equal
Diagonals
 
 
Parallel
Equal
  
Equal
Perpendicular

Square

Yes
Yes

Yes

Yes

Yes

Yes

Parallelogram

Yes

Yes

No
No
No
No
Rectangle

Yes

Yes

No

Yes

Yes

No
Rhombus

Yes

Yes

Yes

Yes

No

Yes

Trapezium
No
No
No
No
No
No
 
Now we got an immense understanding in the concept of polygons and quadrilaterals, now observe the below flow chart which explains about polygons.
 
Flow_chart.png