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受欢迎的 Word Problems >

The area of a circle is 81pi mm^2. What’s its 周长?

解答

T h e a re a o f a c i rc l e i s 81 π m m^{2} . Wha t ’ s i t s c i rc u m f ere n ce ?

解答

c i rc u m f ere n ce : 18 π mm

+1

十进制

56.54866 \dots

求解步骤

Given:

a re a : 81 π m m^{2}

给定

A re a = 81 π

的圆半径:

r = 9

给定

r = 9

的圆周长:

C = 18 π

c i rc u m f ere n ce : 18 π mm

流行的例子

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