Question

1. If the length and breadth of a rectangle are doubled, how many times the perimeter of the
old rectangle will that of the new rectangle be?

2. If the side of a square is tripled, how many times the perimeter of the
first square will that of the new square be?

3. Given alongside is the diagram of a
playground. It shows the length of its sides.
Find the perimeter of the playground.

4. As shown in the figure, four napkins all of the same
size were made from a square piece of cloth of length
1 m. What length of lace will be required to trim all
four sides of all the napkins ?

Answer 1

Answer:

1. 2x

2. 3x

Step-by-step explanation:

Answer 1

Perimeter of rectangle, p = 2 * (l + b)

new length l' = 2l,

new breath b' = 2b,

Hence perimeter of new rectangle is,

p' = 2 * ( l' + b')

p' = 2 * (2l + 2b)

p' = 2 * 2 * (l +b)

p' = 2 * p

Hence the new perimeter is 2 times that of the old one.

Answer 2,

Perimeter of a square, p = 4 * s

New side s' = 3 * s,

Perimeter of the new square, p' = 4 * s'

p' = 4 * 3 * s or 3 * 4 * s

p' = 3 * p,

hence the perimeter of the new square is 3 times that of. the old one.

Answer 3 and Answer 4, diagram not given.

Answer 2

What are you talking about I don’t know what to do with the other stuff