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# Understanding shapes

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mathematics geometry related presentstion by DARSHAN LOKHANDE

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### Understanding shapes

1. 1. UNDERSTANDING SHAPES
2. 2. POLYGONS• A POLYGON is a closed figure made up of three or more line segments. ‘Poly’ means many, hence, polygon means a ‘many sided figure’. Some examples of polygon are: Some examples of none polygons are:
3. 3. Some polygons have special names that correspond to the number of sides in the polygon SIDES NAME FIGURE 3 TRIANGLE 4 QUADRILATERAL 5 PENTAGON 6 HEXAGON 7 HEPTAGON 8 OCTAGON 9 NONAGON 10 DECAGON 11 HENDECAGON 12 DODECAGON
4. 4. TYPES OF POLYGONS1. CONVEX POLYGON: in a polygon, if the line joining any two points lies inside the polygon, then the polygon is a convex polygon.2. CONCAVE POLYGON: In a polygon, if there exists even one line, which when joining two points of a polygon, does not lie inside the polygon, then the polygon is a concave polygon.
5. 5. 3. REGULAR POLYGON: A polygon in which all the sides and all the angles are equal is known as regular polygon.
6. 6. 4. IRREGULAR POLYGON: The polygons that are not regular are called irregular polygons.
7. 7. Figure
8. 8. Properties parallelogram rectangle rhombus squareSides: opposite sides are equal adjacent sides are equal opposite sides are parallelAngles: opposite angles are equal adjacent angles are equal all angles are right anglesDiagonals: diagonals are equal diagonals bisect each other diagonals bisect each other at right angles
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