Question

substitute the given values into the given formula and solve for the unknown variable. if necessary, round to one decimal place. (use the approximation 3.14 for $pi$.) c = 2$pi$r, c = 53.4 (circumference of a circle) r = □

Explanation:

Step1: Write the formula for circumference.

$C = 2\pi r$

Step2: Substitute the given value of C.

$53.4=2\times3.14\times r$

Step3: Solve for r.

First, simplify the right - hand side: $2\times3.14 = 6.28$, so the equation becomes $53.4 = 6.28r$. Then, divide both sides by 6.28: $r=\frac{53.4}{6.28}\approx8.5$

Answer:

$8.5$