Area of square -SxS

Area of rectangle-LxB

Area of parallelogram-HxB

Area of any triangle with sides a b c-√s(s – a)(s – b)(s – c) where s = (a + b + c)/2

Area of equilateral triangle-√3/4x(a x a) where a is the sides

Area of isosceles triangle-b h/2 where b is base and h is height

Area of scalene triangle- h b/2

Perimeter of square-4s

perimeter of rectangle-2(l+w)

perimeter of Parallelogram-2(a+b)

Perimeter of triangle- a+b+c