Circumference = pi*2.5 = 7.85 km
Circumference of 20 / pi = the diameter = 6.3662 (to nearest 4th decimal)
21.99
To the nearest hundredth, the circumference of a circle with a radius of 4 is 25.13
If you have the radius, then area = pi*r2 which you then round to the nearest hundredth. If you do not know the radius but do know the diameter or circumference, you can calculate the radius. Otherwise you need to measure it.
If the radius is 6 units, the diameter is 12. To find the circumference, you multiply the diameter by pi to get 12pi or 37.699, which rounds up to 37.70.
The answer depends on what the number 0.45 refers to: radius, diameter or area?
to find the raduis of any circle, divde the diameter by 2. in this case, the answer would be 3.50
8.456 rounded to the nearest hundredth is 8.46
The final answer depends on what measure is wanted to the nearest hundredth!
The decimal fraction 0.16 is already rounded to the nearest hundredth.
The decimal of .116 rounded up to the nearest hundredth is .12.