Question

How to calculate the area of a pentagon in Go

Answer 1

package main

import (
    "fmt"
)

func pentagonArea(side float64, apothem float64) float64 {
    return 5.0 * (side * apothem) / 2.0
}

func main() {
    side := 5.0
    apothem := 3.0

    area := pentagonArea(side, apothem)

    fmt.Printf("Area = %.2f\n", area)
}


/*
run:

Area = 37.50

*/

 

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Answer 2

package main

import (
    "fmt"
    "math"
)

func area_regular_pentagon(side float64) float64 {
    return (1.0 / 4.0) * math.Sqrt(5*(5+2*math.Sqrt(5))) * math.Pow(side, 2)
}

func main() {
    fmt.Println(area_regular_pentagon(7))
}


/*
run:

84.30339262885938

*/

 

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