Write an algorithm to calculate the area of circle?

Write an algorithm to calculate the area of circle :-

Step 1 : START 

Step 2 : Declare variables ‘a’ and ‘r’ .

Step 3 : Read the values of variable r (radius) .

Step 4 : calculate   “  a = 3.14 * r * r  “ .

Step 5 : Display area of circle (a) .

Step 6 : STOP 

 An algorithm to calculate the area of circle