Solve the problem.
-The diameter of a tree was $11 \mathrm { in }$. During the following year, the circumference increased 2 in. About how much did the tree's diameter increase? (Leave your answer in terms of $\pi$.)
A) $\frac { \pi } { 2 } \mathrm { in }$.
B) $\frac { 11 } { \pi } \mathrm { in }$.
C) $\frac { 13 } { \pi } \mathrm { in }$.
D) $\frac { 2 } { \pi } \mathrm { in }$.

Question

Quizplus · Accepted Answer

The circumference of a circle (or tree in this case) is given by $C = \pi d$, where $d$ is the diameter. An increase of 2 inches in circumference means the increase in diameter is $\frac{2}{\pi}$ inches, since $d = \frac{C}{\pi}$.

Solve the Problem 11in11 \mathrm { in }11in During the Following Year, the Circumference Increased 2 In \mathrm

Solve the Problem $11 \mathrm { in }$ During the Following Year, the Circumference Increased 2 In \mathrm