*Shape**Area**Perimeter*Circle ∏ (Radius)

^{2}2∏(Radius)Square (side)

^{2}4(side)Rectangle length*breadth 2(length+breadth)

1. Area of a triangle = 1/2*Base*Height or

2. Area of a triangle = √ (s(s-(s-b)(s-c)) where a,b,c are the lengths of the sides and s = (a+b+c)/2

3. Area of a parallelogram = Base * Height

4. Area of a rhombus = 1/2(Product of diagonals)

5. Area of a trapezium = 1/2(Sum of parallel sides)(distance between the parallel sides)

6. Area of a quadrilateral = 1/2(diagonal)(Sum of sides)

7. Area of a regular hexagon = 6(√3/4)(side)

^{2}8. Area of a ring = ∏(R

^{2}-r^{2}) where R and r are the outer and inner radii of the ring.