Question

$( \sqrt{3} + 2 \sqrt{5} ) ^{2}$
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Answer 1

Answer:

The verandah 1.5 m wide is constructed all along the outside of a room 5.5 m long and 4m wide. Find (a) the area of the verandah, (b) the cost of cementing the floor of the verandah at the rate of Rs. 20 per sq m.

Answer 2

Sustainable development is a pattern of development that promises the use of resources in a way that meets human needs while preserving the environment so that these needs can be met not only in the present, but also for generations to come. In basic understanding, like today we are able to use the resources given to us, the future generations should also be able to use them for which we need to keep a tab on our usage and use the resources judiciously. Today, we need to fuel the concept of sustainable development to make sure that resources are also available for the future generations Resources can be used judiciously in the following manner. Using bicycle or walking for short distances rather than using a two wheeler or four wheeler can help in saving fuel and also will help in reducing air pollution. Urbanization without deforestation can help us to sustain the natural environment. By using CNG in place of petrol, we can help in reducing air pollution. Judiciously using water resources and not polluting them will help us to preserve our water resources.