relation of pi with circles??
回答 (3)
2009-04-09 8:27 am
✔ 最佳答案
circumference=diameter*piarea of a plane circle=pi*radius^2
volume of a sphere=(4/3)pi*radius^3
surface area of a sphere=4pi*radius^2
2009-04-09 6:21 pm
π is the ratio between the circumference and the diameter of a circle.
i.e. π = circumference / diameter
All circles carry the same π which is approximately 3.141592654...
or 22/7 (low accuracy).
Then, the following formulae of a circle follow :
circumference = diameter * π
___________= 2 * radius * π
area = radius * radius * π
i.e. π = circumference / diameter
All circles carry the same π which is approximately 3.141592654...
or 22/7 (low accuracy).
Then, the following formulae of a circle follow :
circumference = diameter * π
___________= 2 * radius * π
area = radius * radius * π
2009-04-09 8:36 am
I think the relation of pi with circles in two aspects as following:
Firstly, the perimeter of a circle is equal to two times pi and radius,
i.e. perimeter=2πr where r is the radius of a circle.
Secondly, the area of a circle is equal to pi times the square of radius,
i.e. area=πr^2 where r is the radius of a circle.
Blessings,
Samuel Lai Tze Cheong.
Firstly, the perimeter of a circle is equal to two times pi and radius,
i.e. perimeter=2πr where r is the radius of a circle.
Secondly, the area of a circle is equal to pi times the square of radius,
i.e. area=πr^2 where r is the radius of a circle.
Blessings,
Samuel Lai Tze Cheong.
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