Question

the perimeter of a rectangle is240cm.If the breadth of the rectangle is40cm find its length Also find the area of ylthe ractangle​

Answer 1

Answer:

Given that ;

Perimeter of the Rectangle ( P ) = 240cm

Breadth of the Rectangle ( b ) = 40cm

Length ( l ) = ?

Formula :

Perimeter of the Rectangle ( P ) = 2 ( l + b )

P = 2 ( l + 40 )

240 = 2l + 80

240 - 80 = 2l

160 = 2l

l = 160 / 2

L = 80cm

Hence ;

Length of the Rectangle ( l ) = 80cm

Area of the Rectangle ( A ) = ?

Formula :

Area of the Rectangle ( A ) = L × B

A = 80 × 40

A = 3,200cm²

Hence ;

Area of the Rectangle ( A ) = 3,200cm²

Answer 2

Perimeter = 240 cm

Breadth = 40 cm

Let the length be x cm

Perimeter of rectangle = 2×(Breadth + Length)

240 = 2×(40+x)

240/2= x + 40

120 = x + 40

x = 120 - 40

x = 80 cm 《 Length = 80 cm 》

Now ,

Area of rectangle = length × breadth

Area of rectangle = 80 × 40

《 Area of rectangle = 3200 cm² 》