Important formulas:
1. Area of parallelogram = base X height
2. Area of triangle = 1/2 X base X height
3. Area of circle = πr2
4. Circumference of circle = 2πr
5. Perimeter of circle = circumference of circle
6. Area of square = (side)2
7. Area of rectangle = length X breadth
8. Perimeter of square = 4 X side
9. Perimeter of rectangle = 2 (length + breadth)
10. Commonly used units of area is cm2 or m2 or mm2.
