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# Calculate the Third Angle of a Triangle in Go

## The problem#

You’re given two inside angles (in levels) of a triangle.

Write a perform to return the third.

Word: solely optimistic integers will probably be examined.

Choice 1:

``````bundle resolution

func OtherAngle(a int, b int) int {
return 180-a-b
}
``````

Choice 2:

``````bundle resolution

func OtherAngle(a int, b int) int {
if a + b > 180{
return -1
}
return 180 - a - b
}
``````

Choice 3:

``````bundle resolution

import "math"

func OtherAngle(a int, b int) int {
const fullNumber = 180
var thirdNumber int = int(float64(fullNumber) - (math.Abs(float64(a)) + math.Abs(float64(b))))
return thirdNumber
}
``````

## Take a look at instances to validate our resolution#

``````bundle check

import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
. "my/<meta charset="utf-8">resolution"
)

var _ = Describe("Fundamental Checks", func() {
It("OtherAngle(30, 60)", func() { Count on(OtherAngle(30, 60)).To(Equal(90)) })
It("OtherAngle(60, 60)", func() { Count on(OtherAngle(60, 60)).To(Equal(60)) })
It("OtherAngle(43, 78)", func() { Count on(OtherAngle(43, 78)).To(Equal(59)) })
It("OtherAngle(10, 20)", func() { Count on(OtherAngle(10, 20)).To(Equal(150)) })
})
``````
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