The primary arguments used in the pie(...) function are x and labels:

Consequently, the pie chart function takes on the following basic form:

pie(x = sliceData, labels = sliceText)

Where sliceData and sliceText are in vector form.

To create our pie chart, we first calculated the cost information that we wished to display and stored it in a vector variable, like so:

> pieFireGoldCostSlices <- c(6792, 993208)

Next, we created a vector to hold the text labels for our pie's slices:

> pieFireGoldCostLabels <- c("mission cost", "remaining funds")

Then we customized our chart with a main title and specific colors, before executing our complete pie(...) function:

> pie(x = pieFireGoldCostSlices, labels = pieFireGoldCostLabels,
main = pieFireGoldCostMain, col = pieFireGoldCostSpecificColors)

Lastly, we added a legend to our chart to further clarify its components:

> legend(x = "bottom", legend = pieFireGoldCostLabels,
fill = pieFireGoldCostSpecificColors)