# How to Find the Sum of Angles in Golang

## The challenge

Find the total sum of internal angles (in degrees) in an n-sided simple polygon.

`N` will be greater than 2.

## The solution in Golang

Option 1:

```.wp-block-code{border:0;padding:0}.wp-block-code>div{overflow:auto}.shcb-language{border:0;clip:rect(1px,1px,1px,1px);-webkit-clip-path:inset(50%);clip-path:inset(50%);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px;word-wrap:normal;word-break:normal}.hljs{box-sizing:border-box}.hljs.shcb-code-table{display:table;width:100%}.hljs.shcb-code-table>.shcb-loc{color:inherit;display:table-row;width:100%}.hljs.shcb-code-table .shcb-loc>span{display:table-cell}.wp-block-code code.hljs:not(.shcb-wrap-lines){white-space:pre}.wp-block-code code.hljs.shcb-wrap-lines{white-space:pre-wrap}.hljs.shcb-line-numbers{border-spacing:0;counter-reset:line}.hljs.shcb-line-numbers>.shcb-loc{counter-increment:line}.hljs.shcb-line-numbers .shcb-loc>span{padding-left:.75em}.hljs.shcb-line-numbers .shcb-loc::before{border-right:1px solid #ddd;content:counter(line);display:table-cell;padding:0 .75em;text-align:right;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;white-space:nowrap;width:1%}```package solution
func Angle(n int) int {
return (n - 2) * 180
}
```Code language: Go (go)```

Option 2:

``````package solution
func Angle(n int) (r int) {
r = (n-2)*180
return
}
```Code language: Go (go)```

Option 3:

``````package solution
func Angle(n int) int {
return (n/2-1) * 360 + n%2 * 180
}
```Code language: Go (go)```

## Test cases to validate our solution

``````package solution_test
import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Basic tests", func() {
It("Angle(3)", func() { Expect(Angle(3)).To(Equal(180)) })
It("Angle(4)", func() { Expect(Angle(4)).To(Equal(360)) })
})
```Code language: Go (go)```
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