Formulae

Mensuration                          

 1) Area of rectangle = Length (L) x Breadth(B)

2) Perimeter of rectangle = 2(L+B)

3) Area of square = `L^{2}`

4) Perimeter of square = 4L

5) Area of  triangle = `\frac{1}{2}` Base(b) x Height(h)

6) Perimeter of triangle = a + b + c  [Sum of all sides]

Area of right-angled triangle = `\frac{1}{2}` perpendicular (p) x base (b)

Perimeter of right-angled triangle = h + p + b

7) Area of circle = `\pi r^{2}`  `\color{red} {\pi = 3.14 or \frac{22}{7}}`

8) Perimeter of circle = 2`\pi`r