Polygonal Regions
Triangular Region
A triangle is a plane figure formed by three line segments. It is a closed figure. The part of the plane enclosed by the triangle is called the interior of a triangle and the triangular region is the union of a triangle and its interior. The area of a triangle means the area of its triangular region.
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Triangular Region |
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Rectangular Region
The part of the plane enclosed by a rectangle is called the interior of the rectangle and the union of a rectangle and its interior is called the rectangular region.
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By the area of a rectangle, we mean the magnitude of the area of its rectangular region. The area of a rectangle can be expressed as the union of two triangles which will be formed by joining the opposite vertex of the rectangle.Â
Rectangular Region |
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Polygonal Region
The union of a polygon and its interior is called the polygonal region.
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Â It can be expressed as the union of a finite number of triangular regions in a plane, such that if two of these intersect, their intersection is either a point or a line segment.Â