what is the formula for area of circle??

   pie *radius*radius

1.  area of circle = 22/ 7 * r²

 Circle Area = π × r2. Circumference = 2 × π

 where r is radius

pie*radius*radius

pie*radius square

@ Harish Pie is not equal to 22/7 so formula of area of circle is not 22/7*r²

Circle 
Area = π × r² 
Circumference = 2 × π × r
r = radius

pie r square