Author: Nasim Taba, Date: Dec 18, 2016
This repo contain the code to create circle objects with a radius. We can then calculate area and perimeter of the circle object
```
- circle class:
`circle1 <- circle(3)`
- Calculate area of circle:
```
#' area.circle()
#' @return The area of a circle with radius
#' @examples
#' area(circle(3))
#'
area(circle1)
area(circle(3))
```
```
circumference(cricle2)
circumference(circle(4))
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