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Subtract two polygons on google map

I draw three polygons on a Google map that the first is in the second and the second in the third. I want to subtract them in javascript as another form.

P3-P2? P2-P1?

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Lighter than I thought:

var poly1Area = google.maps.geometry.spherical.computeArea(poly1.getPath());
var poly2Area = google.maps.geometry.spherical.computeArea(poly2.getPath());
var poly3Area = google.maps.geometry.spherical.computeArea(poly3.getPath());

poly2Area = poly2Area - poly1Area;
poly3Area = poly3Area - poly2Area;

ref: https://developers.google.com/maps/documentation/javascript/reference?csw=1#spherical

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Source: https://habr.com/ru/post/1794527/

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