Chap 14 Perimeter and Area

Chap 14

Perimeter  and Area

Some Important facts:

1.    The area of a region can be comprise by seeing and by measuring.

2.    1 cm² is the area of square of 1 cm.

3.    Formulae:

(a)   (i)  Perimeter of rectangle

= 2 x length + 2 x breadth

= 2 x (length + breadth)

(ii) Length of rectangle

                            = 1 x perimeter – breadth

                               2

(iii) Breadth of rectangle =

= 1 x perimeter – breadth

                               2

 (b) (i)  Perimeter of square = 4 x side

   (ii) Side of square = 1 x perimeter

                                   4

   (iii) Area of square = (side)²

          (c)     (i) Area of rectangle = length x breadth

                   (ii) Length of rectangle =           area

                                                                          Breadth

                   (iii) Breadth of rectangle =         area

                                                                            length