Question

Find the area and perimeter of TV, laptop or a computer ( if you have ),your Maths workbook, your Maths textbook, drawing book. Draw a table and note down the required details. (5 marks)
 Measure the length, width and height of your living room and find: a) The total surface area of the room, ignoring the area of windows ​

Answer 1

Answer:

Step-by-step explanation:

Let the length of old rectangle = l

Let the breadth of old rectangle = b

Perimeter of the old rectangle = 2(length + breadth) = 2(l + b)

When the length and the breadth of the rectangle are doubled, then

length of the new rectangle = 2l

breadth of the new rectangle = 2b

∴ Perimeter of new rectangle = 2(length + breadth)

= 2(2l + 2b)

= 2 × 2(l + b)

= 2 × perimeter of the old rectangle    [∵ perimeter of old rectangle = 2(l + b)]

Hence, the perimeter of the new rectangle will become two times of the perimeter of the old rectangle.