Answer:
open
Step-by-step explanation:
The answer for
1 - 9.69
2 - 140.07
Answer:
Part 1) The area of the circle is 
Part 2) The circumference of the circle is 
Step-by-step explanation:
step 1
The area of a circle is equal to

we have
---> the radius is half the diameter

substitute


step 2
The circumference of a circle is equal to

we have

substitute


Its proportional.
(I need 20 characters but thats all really.)