Question

the equation of the circumference of a circle is c = 2πr, where r is the radius of the circle. compute the circumference of a circle whose diameter is 3.8 cm. use the approximation π = 3.14 and round your answer to one decimal place. the circumference is 6.0 cm. the circumference is 23.9 cm. the circumference is 7.6 cm. the circumference is 11.9 cm.

Explanation:

Step1: Find the radius

Given diameter $d = 3.8$ cm, and $r=\frac{d}{2}$, so $r=\frac{3.8}{2}=1.9$ cm.

Step2: Calculate the circumference

Using the formula $C = 2\pi r$, with $\pi = 3.14$ and $r = 1.9$ cm. Then $C=2\times3.14\times1.9= 11.932$ cm.

Step3: Round the result

Rounding $11.932$ to one - decimal place gives $11.9$ cm.

Answer:

The circumference is 11.9 cm.