Question

A circular disc has a circumference of 141 meters. If we multiply the radius of the circular disc by 12, what will be the circumference of the new disc? OA) 168 m OB) 248 m OC) 4147 m OD) 352 m

Answer 1

`\begin{gathered} \text{circumference }=\text{ 2}\pi r \\ r=\frac{\text{circumference}}{\text{2}\pi} \\ \text{circumference}=14\pi\text{ m} \\ r=\frac{14\pi\text{m}}{\text{2}\pi} \\ r=7m \\ \text{new raduis} \\ r=(7m)\cdot(12) \\ r=84m \\ \text{new circumference}=(84m)\cdot(2\pi) \\ \text{new circumference}=168\pi\text{ meter} \\ \text{The new circumference is }168\pi\text{ meter} \end{gathered}`