Answered

find the circumference of a circle whose radius is 15.4cm 

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Vivindalkaid
[tex]r=15,4\ cm\\C=2\cdot\ \pi\ \cdot\ r\\C=2\cdot\ \pi\ \cdot\ 15,4\ cm\\C=30,8\ \pi\ cm[/tex]

[tex] \pi\approx\ 3,14[/tex]

[tex]C=30,8\ \cdot\ 3,14\ cm\\C=96,712\ cm[/tex]
π = 3,14

c = 2.π.r
c = 2.3,14.15,4
c ≈ 96,7