Question

question
the radius of a circle is 7.8 cm. find the circumference to the nearest whole number.

Explanation:

Step1: Recall the formula for circumference

The formula for the circumference of a circle is \(C = 2\pi r\), where \(r\) is the radius.

Step2: Substitute the given radius into the formula

Given \(r = 7.8\) cm, we substitute into \(C = 2\pi r\). So \(C=2\times\pi\times7.8\).

Step3: Calculate the value

\(C = 15.6\pi\). Using \(\pi\approx3.14\), we have \(C\approx15.6\times3.14 = 48.984\).

Step4: Round to the nearest whole number

Rounding \(48.984\) to the nearest whole number. Since the decimal part \(0.984\gt0.5\), we round up.

Answer:

\(49\)