Question

the ratio of the length and breadth of a rectangle is 5 : 4 and its area is 180 cm square. find its length and breadth find its perimeter​

Answer 1

Step-by-step explanation:

Area = length × breadth

Let the length and breadth be 5x & 4x

:- Area = 180

5x × 4x = 180

20x^2 = 180

x = 3

:- Length = 5×3 = 15 cm

Breadth = 4×3 = 12 cm

:- Perimeter = 15cm + 12cm

= 27cm

Answer 2

Answer: Length=15cm and Breadth=12cm  and Perimeter = 54 cm

Step-by-step explanation:

Let the length and breadth be 5x & 4x

Area = 180

formula of area = l ×  b

5x × 4x = 180cm^2

20x^2 = 180cm^2

x = 3 cm

and then

length = 5 × 3  = 15cm

breadth=4 × 3=12cm

perimeter = 2(l +b)

=2×(15+12)

=2× 27

=54cm