Calculate area of circle
( Equivalent to: surface area of circle )
In next fields, kindly type the dimensions of your shape in the text box under title [ Unknowns: ]. After you type your value, click "CALCULATE" button; the answer will be automatically calculated and displayed in the text box under title [ Answer: ]. Also, you will be able to animate your shape through buttons under the below figure.
How to Calculate Area Of Circle
Example: What is the area of circle with radius = 21 units?
As;
area of circle = π*(radius)2
By substituting the above given data in the previous function;
(i.e.) = π*(21)2
Answer is: units2.
Practice Question: Calculate area of circle for the following problems:
N.B.: After working out the answer of each of the next questions, click adjacent button of see the correct answer.
( i ) radius = 14 units
( ii ) radius = 10 units
( iii ) radius = 11 units