Question

mensuration

a wire of length 20 cm is to be folded in the form of a rectangle. if the length of the rectangle is 7m, find the area of the rectangle​

Answer 1

Step-by-step explanation:

It is given that a wire of length 20 m is to be folded in the form of a rectangle;

∴ we have: Perimeter of the rectangle =20 m

⇒2(Length + Breadth) =20 m

⇒(Length + Breadth) =

20/2

=10 m

Since, length and breadth are positive integers in metres, therefore, the possible dimensions are: (1,9), (2,8), (3,7), (4,6)

Also, (5,5) can be considered as a rectangle (as every square is a special type of rectangle )

Thus, five rectangles can be formed with the given wire.

Answer 2

Answer:

21 cm²

Step-by-step explanation:

If the wire of length 20 cm is to be form of rectangle then its perimeter will be 20 cm.

the length of rectangle is 7cm.

let the breadth = b cm

so,

2(7+b)=20

or, 7+b =10

so, b=3

so the area is =(7×3)cm²=21 cm²