Question

find the radius of circle whose circumference is 15.4cm

Answer 1

circumference=2πr
15.4=2(22/7)r
15.4/2=22/7r
r=15.4×7/22×2
r=2.45cm
Hope it helps.
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Answer 2

$\textbf{\huge\underline{\underline\red{Solution} : - }} \\ \\ \textbf{\underline{\underline\red{given} : - } radius\: of \: circle \: is \: } \\ \textbf{15.4 cm.} \\ \\ \textbf{\underline{\underline\red{formula} : - }} \\ \\ = > \bold \purple{circumference \: of \:circle \: = 2 \: \pi \: r } \\ \\= > \bold \purple{circumference \: of \:circle \: = 2 \times \frac{22}{7} \times \: 15.4} \\ \\ = > \bold \purple{circumference \: of \:circle \: = 2 \times 22 \times2.2} \\ \\ = > \bold \purple{circumference \: of \:circle \: =96.8 \: cm } \\ \\ \bold{ \underline\red{hence \: circumference \: of \: circle \: is \: \: 96.8 \: cm.}} \\ \\ \fcolorbox{red}{white}{i \: hope \: it \: helps \: you.}$