Wednesday, January 9, 2019

Area Formula for a Circle

Net world | January 09, 2019 | | |
It's very important to know how to calculate area formula for a circle? Dear, Circle Mensuration learners. here we're discussing this specific topic with all formulas and solved the question, explanation and concept,
What is Circle?
A set of connected dots and all are equidistance from another dot which is situated in the centre. For brief information, you can visit the Circle Concept.
 Area formula for a circle

To calculate Area of a circle, You need to remember some formulas according to the given information in question. And use formulas which required.
General Formula
πr²
π is the sing of Pi and its value in fractional 22/7 and in decimal number→ 
3.141592654.. And the r is the radius of the circle. Please note, the radius is the half of the diameter length.

Circumference to area calculation of a circle =C²/4π

Here, 'C' is the Circumference of a circle and π is the sing of Pi.
The area calculation from Diameter value of a circle
Diameter is the longest line of a circle and it touched centre and two outer dots. The formula is πr². Where r is the radius of the circle and its mean half of Diameter. In a certain question, if you got diameter or radius then easily you can calculate area using above formula.




Solved problems related to Circle Area

Area Difference between two Circles
When you have to find the different area between two circles then use below formulas.
When you know Radius: By knowing the radius length of two circles then it became easier to know the difference the area between them. Just apply the following formula. 
π(r1²-r2²). You have another option to find the answer by separate calculation and finally subtract the area. But it is fewer steps to do. If you are not clear about this formula then let me clear the actual concept.





We have taken π as common from two different circles. But r is not common and it has different value so we subtract from each other just because of finding the difference of area between two circles. Please note, we are no calculation the area- on;y calculating difference of area.

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