8. If perimeter of a rectangle is 40 cm and length is
12 cm, then its breadth is​

2 thoughts on “8. If perimeter of a rectangle is 40 cm and length is<br />12 cm, then its breadth is​”

1. Answer:

   8 cm

   Step-by-step explanation:

   Given that

   P = 40, l = 12

   As we know that

   Perimeter of Rectangle (P) = 2 * (length + breadth)

   ie. P = 2*(l+b)

   => 40 = 2 * (12 + b)

   => 40 / 2 = [2*(12 + b)]/2 (Divide both side by 2)

   => 20 = 12 + b

   => 20 – 12 = 12 – 12 + b (Subtract 12 from both side)

   => 8 = b

   => b = 8

   Ans: Breadth is 8cm

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2. Answer :

   • Breadth of rectangle is 8cm.

   Given :

   • Perimeter of rectangle is 40cm
   • Length of rectangle is 12cm

   To find :

   • Breadth of rectangle

   Solution :

   As we know that

   • Perimeter of rectangle = 2(l + b)

   Where , l is length and b is breadth

   》Perimeter of rectangle = 2(l + b)

   》40 = 2(12 + b)

   》12 + b = 40/2

   》12 + b = 20

   》b = 20 – 12

   》b = 8cm

   Hence , Breadth of rectangle is 8cm.

   Verification :

   • Length is 12cm
   • Breadth is 8cm
   • Perimeter is 40cm

   As we know that,

   • Perimeter of rectangle = 2(l + b)

   》40 = 2(12 + 8)

   》40 = 2(20)

   》40 = 40

   Hence Verified

   Reply