Introduction
Area of a region, bounded by a geometrical figure measures the portion of the plane occupied by the region.
Theorem1
Parallelograms on the same base and between the same parallels are equal in area.
Theorem2
The area of a parallelogram is equal to that of a rectangle of the same base and of the same altitude.
Theorem3
The area of a triangle is half that of a parallelogram standing on the same base and between the same parallels.
Summary
Parallelograms on the same base and between the same parallels are equal in area.
