#' Calculate the area of a circle.
#'
#' @param r radius of a circle.
#' @return The area of the circle.
#' @examples
#' area_circle(2)
#' area_circle(pi)
#' @export
area_circle <- function(r) {
if (r > 0) {
pi * r**2
}
else {
"Can't have a negative value"
}
}
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