Calculate surface area of polygon within the lines of another polygon

How do you find the area of multiple polygons in Qgis?

Quote from video: Now i go to the field calculator to calculate the areas. The output field name is sketch area it's a decimal. Number i keep the length at 10 and i change the precision the amount of decimals to 2.

How do you find the area of a polygon with 5 sides?

The basic formula for the area of a regular pentagon is, Area of pentagon = 1/2 × p × a; where ‘p’ is the perimeter of the pentagon and ‘a’ is the apothem of a pentagon.

How do I find the area of a layer in Qgis?

Quote from video: And click on run over here. So friend we can see the reprojected polygon save file.