Pentagon – Properties In a pentagon the sum of the internal angles is equal to 540°. In a regular pentagon each interior angle measure is 108°, and each exterior angle measure is 72°. A regular pentagon has five axes of symmetry, each one of them passes through a vertex of the pentagon and the middle […]

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Lines of symmetry in a regular Pentagon What is line of symmetry ? The line of symmetry is the imaginary line where we could fold the image and have both halves match exactly. If a given line splits a given figure into two identical halves, we say that the line has a line of symmetry […]

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Lines of Symmetry In Regular Polygons What is line of symmetry? An object is considered to be symmetrical, if when folded or sliced in half, both halves are mirror images of one another. An object is said to have a line of symmetry when one half of it is the mirror image of the other. […]

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Polygons – Classification We classify polygons to the number of side orvertices based they have. A polygon can be classified by it’s number of a sides and measure of angles. First, we classify by it’s number of a sides.               Classified by measuring the sides The name of a polygon usually […]

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Interior & Exterior angle of a polygon  In this lesson we will learn the, (1) Solutions of problems on interior and exterior angles of a polygon.  Example 1: Find the sum of all interior angles in a regular triangle (3-sided). Solution: Step 1: Write the formula Sum of interior angles of a polygon = (n-2) […]

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  Diagonals of Polygon’s In geometry, a line segment joining two vertices of a polygon or polyhedron, when those vertices are not adjacent is known as Diagonal.  Diagonals of Polygon’s A polygon’s diagonal’s are line segments, that joining from one corner to another corner. Formula for number of diagonals = n(n-3)/2 where n is number of sides or […]

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 2D Shapes – Names and Properties Definition and Properties  2-dimensional shapes have 2 dimensions length and width.  Rectangle  A rectangle is a 2-dimensional 4 sided polygon. A rectangle have 4 sides, 4 angles and 4 vertices. The total of 4 angles is 360 degree. Square A square is a 2-dimensional 4 sided polygon. A square have 4 sides, 4 angles and 4 vertices. The total of […]

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2D – Shapes – Definition – Different Shapes  Definition: 2D shapes are flat and also known as plane shapes, ‘2D’ stands for 2-dimensional. These shapes can be drawn on paper and have length and width. We can measure length and width. Example: Rectangle, triangle, square, circle, oval, etc. are 2 dimensional objects.

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