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פּוֹפּוּלָרִי Word Problems >

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

פתרון

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 ?

פתרון

c i rc u m f ere n ce : 18 π mm

+1

עשרוני

56.54866 \dots

צעדי פתרון

Given:

a re a : 81 π m m^{2}

A re a = 81 π

רדיוס המעגל בהינתן:

r = 9

r = 9

היקף המעגל בהינתן:

C = 18 π

c i rc u m f ere n ce : 18 π mm

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