Question

9. A rectangle has the area equal to that of a square of side 80 cm. If the breadth of the rectangle
is 20 cm, find its length.​

Answer 1

Given:- area of rectangle with breadth 20cm is equal to the area of square with side 80cm.

To find:- length of rectangle.

Solution :-

Area of rectangle = area of square

Area of rectangle = side × side

Area of rectangle = 80×80cm²

Area of rectangle = 6400cm².

Now,

⇒ Area of rectangle = length × breadth

6400 = length × 20

length = 6400/20

length = 320cm

Hence, the length of rectangle is 320cm.

Answer 2

Answer:

Length= 320 cm

Step-by-step explanation:

Area of Square= Side*side

Area of the square= 80x80

=$6400^{2}$ cm

Area of rectangle= Area of sqaure

Area of rectangle = Length x Breadth

Therefore, the length of rectangle= area of rectangle/ breadth of the

rectangle

= $6400/20$

L= 320 cm