of 13
It is a pentagon.
It is a five sided polygon.
A polygon have fives sides and five corners is called pentagon.
The pentagon is divided into three triangles
So, the sum of the inner angles of the polygon is 3*180=540
It is a hexagon.
It is a six sided polygon.
A polygon six sided and six corners is called hexagon.
The hexagon is divided into four triangles. So, the sum of the inner angles of the hexagon is 4*180=720
GROUP POLYGONS NO. OF SIDES
NO.OF TRIANGL
ES
SUM OF THE INNER ANGLES OF
THE TRIANGLES
SUM OF THE INNER
ANGLES OF THE
POLYGON
1 2 3
PENTAGON
HEXAGON
N SIDED POLYGON
5 6
N
3 4
N - 2
18+18+18
180 + 180
+ 180
18+180 +
180+.+180
540
720
(N-2)*180