Question

area of a recangle is 51.2 dm2 and the sides are in the ratio 5 : 4 . find its perimeter. ​

Answer 1

Answer:

Director of I P KURREY COACHING MALKHARODA

Answer 2

Step-by-step explanation:

$\text{Let the side be x dm}$

$\text{Than side are 5x and 4x}$

$\underline \text {According to the question}$

$\sf \bold{5x \times 4x = 51.2}$

$\sf \: 20x {}^{2} \: = 51.2$

$x {}^{2} \: = \: \frac{512}{20 \times 10}$

$\bold {x {}^{2} \: = 2.56}$

$\bold{x \: = \: 1.6}$

So side are 5x = 5 X 1.6 = 8 dm

4x = 4 X 1.6 = 6.4 dm

$\sf \: Perimeter = 2( 8+6.4)$

$\implies \sf \: 2 \: \times 14.4$

$\large{ \sf28.8 dm}$