28 km
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The nearest hundred of 279 is 300. When determining the nearest hundred, you look at the tens digit of the number in question. Since the tens digit of 279 is 7, which is greater than 5, you round up to the nearest hundred, which is 300.
40,000,000
200 km
24.0
The circumference is equal to pidiameter, or 3.143km 9.42 or 9 km rounded to the nearest km