Question

A pizzas has a circumference of 12 and 1/4 pi. What is the radius

Answer 1

`\bf \textit{circumference of a circle}\\\\ C=2\pi r\quad \begin{cases} r=radius\\ ------\\ C=12(1)/(4)\pi \\\\ \qquad (12\cdot 4+1)/(4)\pi \\\\ \qquad (49)/(4)\pi \end{cases}\implies \cfrac{49\pi }{4}=2\pi r \\\\\\ \cfrac{49\underline{\pi} }{8\underline{\pi} }=r\implies \cfrac{49}{8}=r\implies 6(1)/(8)=r`