Question

A rectangular park in New Delhi , developed by the local authority, has the following dimensions in meters: 11x-7 by x+5y . If x = 10 and y= 20 , find the perimeter of the park. Why do you think a city needs parks and other reserved green areas ? Give 3 advantages. *​

Answer 1

Answer :-

• Perimeter of park = 426 units

Given :-

• Length of park = 11x - 7
• Width of park = x + 5y
• Value of x = 10
• Value of y = 20

To Find :-

• Perimeter of park = ?

Explanation :-

As we have the dimensions of the park and value of 'x' & 'y', we will find the measure of Length and Width of park.

Substituting the value of 'x' & 'y'

$\sf \odot \: Length \implies 11x - 7 \implies 11(10) - 7 = \bold{103 \: unit}$

$\sf \odot \: Width \implies x+5y \implies 10+5(20) = \bold{110 \: unit}$

Finding perimeter of park,

$\blue { \boxed { \bf \bigstar \: Perimeter \: of \: Park = 2 \: (L+B) \: \bigstar }}$

$\sf : \: \leadsto 2 \: (103 + 110) \: units$

$\sf : \: \leadsto 2 \: (213) \: units$

$\sf : \: \leadsto 2 \: \times 213 \: units$

$\red { \underline { \boxed { \bf : \: \leadsto 426 \: units }}}$

Hence, the perimeter of the park is 426 units.

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Question. Why do you think a city needs parks and other reserved green areas? Give 3 advantages.

Answer.

• Green urban areas facilitate physical activity and relaxation, and form a refuge from noise.
• Urban parks and gardens play a critical role in cooling cities, and also provide safe routes for walking and cycling for transport purposes as well as sites for physical activity, social interaction and for recreation.

3 Advantages of parks :-

1. Parks helps us for reducing air pollution
2. Parks are also a source of positive economic benefits.
3. Parks provide intrinsic environmental, aesthetic, and recreation benefits to our cities.

Answer 2

Answer :-

Perimeter of park = 426 units

Given :-

Length of park = 11x - 7

Width of park = x + 5y

Value of x = 10

Value of y = 20

To Find :-

Perimeter of park = ?

Explanation :-

As we have the dimensions of the park and value of 'x' & 'y', we will find the measure of Length and Width of park.

Substituting the value of 'x' & 'y'

$\sf \odot \: Length \implies 11x - 7 \implies 11(10) - 7 = \bold{103 \: unit}⊙Length⟹11x−7⟹11(10)−7=103unit$

$\sf \odot \: Width \implies x+5y \implies 10+5(20) = \bold{110 \: unit}⊙Width⟹x+5y⟹10+5(20)=110unit$

Finding perimeter of park,

$\blue { \boxed { \bf \bigstar \: Perimeter \: of \: Park = 2 \: (L+B) \: \bigstar }}$

★PerimeterofPark=2(L+B)★

$\sf : \: \leadsto 2 \: (103 + 110) \: units:⇝2(103+110)units$

$\sf : \: \leadsto 2 \: (213) \: units:⇝2(213)units$

$\sf : \: \leadsto 2 \: \times 213 \: units:⇝2×213units$

$\red { \underline { \boxed { \bf : \: \leadsto 426 \: units }}}$

Hence, the perimeter of the park is 426 units.

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Question. Why do you think a city needs parks and other reserved green areas? Give 3 advantages.

Answer.

Green urban areas facilitate physical activity and relaxation, and form a refuge from noise.

Urban parks and gardens play a critical role in cooling cities, and also provide safe routes for walking and cycling for transport purposes as well as sites for physical activity, social interaction and for recreation.

3 Advantages of parks :-

Parks helps us for reducing air pollution

Parks are also a source of positive economic benefits.

Parks provide intrinsic environmental, aesthetic, and recreation benefits to our cities.