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update readme
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@mamantoha
mamantoha committed Apr 29, 2024
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Expand Up @@ -20,6 +20,8 @@ Calculate the approximate area of the polygon were it projected onto the earth.

## Usage

Calling `RingArea.ring_area` returns a `RingArea::Area` object which can provide output in kilometers, meters, miles, feet, etc.

```crystal
require "ring_area"
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