Circumfrence: pi times diameter
7.9*

circumfrence is approximatley 24.806
area:

a=

*(1/2(d))^2
a= 48.99
18 plus 12 divided by 2 = thats how u get the answer
Answer:
go to omnicalculator.com they have all sorts of calculators including one called a percent changer calculator
Step-by-step explanation:
The average can be calclculated as follows:
average = sum of number/number of numbers
average = (19+45) / 2 = 64/2 = 32