MATHEMATICS

 https://drive.google.com/file/d/1xueOFT2pZW-lhoeqlZD3r46FXR2i2ct2/view?usp=drivesdk

 Prime factors are numbers with two factors , which are 1 and itself only.  Example factors of  5 are 1 and 5 only so it's a prime number. Other examples of prime factors are ; 3 factors 1&3. 7 ;has factors 1&7. 17 ;has factors 1&17. 6 ;has factors 1,2,3,6 there it's not a prime number. 1 ; has factors are 1 only therefore it's not a prime number. So from the given list  select prime number. (A) 10;11;12;13;14;15;17;18;19;20 From the given list select prime numbers and also list factors of prime number you have selected.  (B) 30,31,32,43,44,45,46,47,66,67,78,79,80,81             

 Area of a circle=3.14×r^2