Calculating a total area using coordinates passed from a json file

I am trying to calculate a total area using coordinates passed from a json file. I wrote these lines given below to pass them to Matlab and it works fine. The problem is I couldn't figure out how to extract the coordinates correctly and use them to calculate the total area. Any advice? Any built-in function i can use?

jsonFile = 'myfile.json';
jsonStr = fileread(jsonFile);
jsonData = jsondecode(jsonStr);

Here is a sample from the json file:

{"type":"FeatureCollection","name":"myfile","crs":{"type":"name","properties":{"name":"urn:ogc:def:crs:OGC:1.3:CRS84"}},"features":[{"type":"Feature","properties":{"GID_0":"GEO","COUNTRY":"Georgia"},"geometry":{"type":"MultiPolygon","coordinates":[[[[43.8995,41.1648],[43.8862,41.164],[43.8532,41.1663],[43.8445,41.1655],[43.8229,41.1583],[43.789,41.1408],[43.7769,41.1372],[43.7699,41.1329],[43.7505,41.1136],[43.7448,41.1116],[43.7297,41.1138],[43.7062,41.1219],[43.6921,41.1312],[43.6755,41.1382],[43.6671,41.1375],[43.6525,41.1301],[43.6367,41.1254],[43.6134,41.1255],[43.5746,41.1475],[43.5656,41.1494],[43.5413,41.1489],[43.4903,41.1295],[43.4711,41.1295],[43.4629,41.1413],[43.4555,41.161],[43.451,41.1672],[43.4372,41.1794],[43.4052,41.1882],[43.3841,41.1995],[43.3747,41.2019],[43.3554,41.2012],[43.2744,41.1816],[43.248,41.1774],[43.2265,41.1761],[43.2336,41.1873],[43.2318,41.1927],[43.1981,41.2475],[43.1921,41.2521],[43.176,41.2547],[43.1533,41.2456],[43.1315,41.2497],[43.1239,41.2541],[43.1282,41.2575],[43.1406,41.263],[43.1594,41.2682],[43.1749,41.275],[43.188,41.2851]

Answer 1

[Adam Danklefsen]

Try the Shoelace Method

Shoelace formula - Wikipedia