Question

1. crater lake in oregon is shaped like a circle with a diameter of about 5.5 miles.

a. how far is it around the perimeter of crater lake?

Explanation:

Step1: Find the radius

The radius \(r\) of a circle is half of the diameter \(d\). Given \(d = 5.5\) miles, so \(r=\frac{d}{2}=\frac{5.5}{2}=2.75\) miles.

Step2: Use the formula for the circumference of a circle

The formula for the circumference \(C\) of a circle is \(C = 2\pi r\) or \(C=\pi d\). Using \(C=\pi d\) (since \(d\) is given), and taking \(\pi\approx3.14\), we have \(C = 3.14\times5.5\).

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Answer:

The distance around the perimeter (circumference) of Crater Lake is approximately \(17.27\) miles.