how to find area of rectangle? Is there any function to do it?
Rectangle - Wikipedia
But I assume that it goes beyond this and you haven't seen the Shape_Area field in a featureclass table, assuming that you have one.
Perhaps you need to elaborate on your situation
Here is one way to do it: How To: Calculate Geometry in ArcGIS Pro
If you're just viewing your features on a map, I'm a big fan of the Measure Features tool, which is found on the Map tab of your ribbon.
Measure—ArcGIS Pro | Documentation
It lets you pick your units and everything, then shows you perimeter and area with just one click.
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