Understanding shapes

mathematics geometry related presentstion by DARSHAN LOKHANDE

1. UNDERSTANDING SHAPES

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. Some polygons have special names that correspond to the number of sides in the polygon 3 4 5 6 7 8 9 10 11 12 TRIANGLE QUADRILATERAL PENTAGON HEXAGON HEPTAGON OCTAGON NONAGON DECAGON HENDECAGON DODECAGON NAME SIDES FIGURE

4. TYPES OF POLYGONS CONVEX POLYGON: in a polygon, if the line joining any two points lies inside the polygon, then the polygon is a convex polygon. 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. 3. REGULAR POLYGON: A polygon in which all the sides and all the angles are equal is known as regular polygon.

6. 4. IRREGULAR POLYGON: The polygons that are not regular are called irregular polygons.

7. F igure

8. parallelogram rectangle rhombus square Properties Sides: opposite sides are equal adjacent sides are equal opposite sides are parallel Angles: opposite angles are equal adjacent angles are equal all angles are right angles Diagonals: diagonals are equal diagonals bisect each other diagonals bisect each other at right angles

9. Project by-DARSHAN LOKHANDE