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0.0101
0.2551
Circumference of a circle = 2*pi*radius Circumference = 2*pi*25 =157.0796327 inches or 157 inches correct to three significant figures.
$25,000,000,000.
To find 25 percent of a number, multiply the number by 0.25. In this instance, 0.25 x 1055.55 = 263.8875. If the number refers to a unit of currency, don't forget to round to the appropriate number of significant figures and add the appropriate currency symbol.