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受欢迎的 Word Problems >

The 周长 of a circle is 84 cm. Find the area of the circle, rounding your answer to 3 significant figures.

解答

T h e c i rc u m f ere n ce o f a c i rc l e i s 84 c m . F in d t h e a re a o f t h e c i rc l e, ro u n d in g yo u r an s w er t o 3 s i g ni f i c an t f i gu res .

解答

a re a : \frac{1764}{π} c m^{2}

+1

十进制

561.49863 \dots

求解步骤

Given:

c i rc u m f ere n ce : 84 c m

给定

C i rc u m f ere n ce = 84

的圆半径:

r = \frac{42}{π}

给定

r = \frac{42}{π}

的圆面积:

A = \frac{1764}{π}

a re a : \frac{1764}{π} c m^{2}

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