Golang. Point belong to the circle?

The last example on Pythagoras’ theorem is quite simple. Let’s take a problem from the same topic, but more complicated. Suppose we have a circle in the center of x-axis and y-axis (i.e. center at coordinates 0,0). Let’s write a test for finding an arbitrary point inside the circle.

Here again Pythagoras will help us. In the general case, the formula is as follows:

(x - center_x)^2 + (y - center_y)^2 < radius^2

But our conditions are a little simpler, the center of the circle is at coordinates 0,0; that’s why the code is like this:

package main

import (

func main() {

	r := 11.0

	var x, y float64 = -7.77, -7.77

	if math.Pow(x, 2)+math.Pow(y, 2) <= math.Pow(r, 2) {
	} else {

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