Question

How to calculate the area of a pentagon in Scala

Answer 1

object Main {

  def pentagonArea(side: Double, apothem: Double): Double =
    5.0 * (side * apothem) / 2.0

  def main(args: Array[String]): Unit = {
    val side = 5.0
    val apothem = 3.0

    val area = pentagonArea(side, apothem)

    println(f"Area = $area%.2f")
  }
}


/*
run:

Area = 37.50

*/

 

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Answer 2

object Main {

  def area_regular_pentagon(side: Double): Double = {
    (1.0 / 4.0) * math.sqrt(5 * (5 + 2 * math.sqrt(5))) * math.pow(side, 2)
  }

  def main(args: Array[String]): Unit = {
    println(area_regular_pentagon(7))
  }
}


/*
run:

84.30339262885938

*/

 

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