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Thought-Process to Discover Knowledge

Welcome to nubtrek.

Books and other education websites provide "matter-of-fact" knowledge. Instead, nubtrek provides a thought-process to discover knowledge.

In each of the topic, the outline of the thought-process, for that topic, is provided for learners and educators.

Read in the blogs more about the unique learning experience at nubtrek.continue

In the topic "mensuration", the foundation focuses on learning

 •  what is measurement standard?

 •  Absolute and Derived Standards


In this page, the formula to find area of a circle is introduced



click on the content to continue..

We have learned the following

 •  Length of a real-life object or a line can be a decimal number in which the decimals do not end or do not repeat.

 •  Circumference of a circle is `pi` times the diameter.

Similarly, the area of a circle of `1cm` radius is also a decimal number in which the decimals do not end or repeat. It is calculated that the area of a circle is `pi xx r xx r` or `=pir^2`.

What is the area of a circle of radius `1cm`?

  • `pi cm`
  • approximately `22/7 cm`
  • approximately `3.14cm`
  • all the above
  • all the above

The answer is "all the above"

Area of a Circle :
` = pi r^2`

Solved Exercise Problem:

What is the area of a circle of `1/pi cm` radius?

  • `1cm^2`
  • `1/pi cm^2`
  • `1/pi cm^2`

The answer is "`1/pi cm^2`".

Area

`=pi r^2`

`=pi xx 1/pi xx 1/pi`

`=1/pi cm^2`

                            
slide-show version coming soon