The diameter of the circle is 15 cm. Find the circumference.
| February 24, 2021 | education
The circumference is calculated using the formula:
l = 2пr = пd, where
n = 3.14.
To convert centimeters to decimeters, we use the ratio:
1 dm = 10 cm.
When rounding a decimal fraction to a certain digit, you must look at the digit of the previous digit. If that is less than five, then all digits below the required one are simply discarded. If it is more than 5, then all the digits below the required one are discarded, and the figure of the required bit is increased by 1.
Find the circumference:
l = 15 * 3.14 = 47.1 cm = 4.71 dm ≈ 5 dm.
Answer: l ≈ 5 dm.
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