Question

# To protect an elm tree in your backyard, you need to attach gypsy moth caterpillar tape around the trunk. The tree has a 1.1-ft diameter. What length of tape is needed?

Solution

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The length of the tape is equal to the circumference of the trunk.

The formula for the circumference is:

$C=2\pi r\text{ or }C=\pi d$

where $r$ is the radius and $d$ is the diameter.

We are given that $d=1.1$ ft so we use the second formula:

$C=\pi (1.1)$

$C=1.1\pi\approx \color{#c34632}3.5\text{ ft}\color{white}\tag{1}$

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