Question

1- The area of a circle is 38.5 cm. Find it's radius.
2- The circumference of a circle is 38.5 cm. Find it's radius.
Please answer with method.​

Answer 1

Answer:

3.5

6.12

Step-by-step explanation:

The area of circle

=πr^2

38.5= 22 x r x r

           7

r^2   =  38.5 x 7

                22

r^2   = 12.25

r       =√12.25

r       = 3.5

The circumference of circle

=2πr

38.5 =2πr

38.5= 2 x 22 x r

                 7

r      = 38.5 x 7

         2 x 22

r      = 269.5

           44

        =6.12