Name of the teacher : saleena.s
Standard:9
unit:1
Topic : interior angles of polygon
Objective : To understand that th...
INTERIOR ANGLES OF A POLYGON
STEPS TO FIND OUT THE INTERIOR ANGLES OF POLYGONS
 Polygons can be divided into triangles by joining
alternate vertices...
POLYGONS CAN BE DIVIDED INTO TRIANGLES BY JOINING ALTERNATE VERTCES
SHAPE
NUMBER
OF
SIDES
NUMBER
OF
TRIANGLES
SUM OF THE
ANGLES
(DEGREE)
TRIANGLE 3 1=(3-2) 1*180=180
QUADRILATERAL...
From the above table we can conclude that the sum of
the angles of a polygon having ‘n’ sides is (n-2)180.As
the number ...
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Published on: Mar 4, 2016
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  • 1. Name of the teacher : saleena.s Standard:9 unit:1 Topic : interior angles of polygon Objective : To understand that the sum of interior angles a polygon HAVING ‘N’ SIDES =(N-2) *180
  • 2. INTERIOR ANGLES OF A POLYGON
  • 3. STEPS TO FIND OUT THE INTERIOR ANGLES OF POLYGONS  Polygons can be divided into triangles by joining alternate vertices.  The number of triangles=Two less than the number of sides of the original polygon  Since the sum of angles of a triangle is 180,we can find the sum of angles of polygon by multiplying the number of triangles with 180
  • 4. POLYGONS CAN BE DIVIDED INTO TRIANGLES BY JOINING ALTERNATE VERTCES
  • 5. SHAPE NUMBER OF SIDES NUMBER OF TRIANGLES SUM OF THE ANGLES (DEGREE) TRIANGLE 3 1=(3-2) 1*180=180 QUADRILATERAL 4 2=(4-2) 2*180=360 PENTAGON 5 3=(5-2) 3*180=540 HEXAGON 6 4=(6-2) 4*180=720
  • 6. From the above table we can conclude that the sum of the angles of a polygon having ‘n’ sides is (n-2)180.As the number of sides increases the sum of angles increases by 180 degree

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