The formula we'll use to find the surface area is:
SA = 4*pi*r^2
In this case, the radius is r = 2.3 meters
SA = 4*pi*r^2
SA = 4*pi*(2.3)^2
SA = 66.47610054996
SA = 66.48 square m
You'll type the expression you see for step 2 into your calculator to get the result of step 3. The result is approximate. Let your calculator handle the decimal digits of pi as your teacher instructs. The last step is us rounding to two decimal places. The units for the surface area are in square meters, because we can effectively unwrap the outer surface (think of it like unwrapping a present) to lay it out flat.
The percentage of people at the scathing ring that are Youth is 65%. You would have to add 13 + 7, to get 20. Then you do 100 percent divided by 20 to get 5. Finally, you would do 5 times 13 to reach 65%.
