Three or more - up to infinitely many.
The only general way is to divide the pentagon into three triangles, calculate the areas of the triangles and add them together.
five
what is the perimeter of a pentegon?
A pentagon has five vertices.
A pentagon has 5 diagonals.
A pentagon has 5 verticies.
A pentagon has five sides.
A pentagon has five line segments.
Exterior degrees 360 Interior degrees 540
No, a pentagon is not a parallelogram.
It is a Pentegon