Question

the sides of rectangle are in ratio 4:5 and it's perimeter is 90 find dimension and area​

Answer 1

Step-by-step explanation:

We know that the sum of the lengths of

all sides of your rectangle are equal to

90 and that the sides have a ratio of 4:5.

We can solve this using simple algebra.

Lets say the shorter side is 4x in length and the longer side is 5x based on the ratio given in the problem.

For all rectangles, perimeter

=2(length)+2(width)

So if we substitute the x values we assigned above, we get 2(4x)+2(5x)=90

We can simplify this equation:

8x+10x=90

18x=90

Then divide both sides by 18 to solve for x;

x=5.

If shorter side = 4x, and x =5, the width is

4*5 = 20cm

If longer side = 5x and x=5, the length is 5*5 = 25cm

For all rectangles, Area=length x width

Using the values we calculated above:

Area = 20cm x 25cm

= 500cm

Answer 2

perimeter of rectangle is 2(l+b)

let side be x

then 4x +5x=9x

then 90 =2(4x + 5x)

90=2(9x)

90=18x

x=90/18

x=5

area of rectangle is l multiply b

l=4(5)=20

b=5(5)=25

area=20(25)

. =500 ans