Question

Santa is sewing fringe to the edge of a round rug for her living room. If the rug measures 60 inches across, how many inches of fringe does Santa need?

Answer 1

Hello there. To solve this question, we'll have to remember how to calculate the measure of a circumference.

Given a circle with diameter d, as in the following drawing:

The measure of the circumference C can be found by the formula:

$C=\pi\cdot d$

In this case, knowing that the rug measures 60 inches across, to find how many inches of fringe Santa needs, we simply plug in d = 60

$C=\pi\cdot60$

Using an approximation for pi:

$\pi\approx3.1415$

We get that:

$C\approx188.5\text{ in}$