polyon is?
2006-09-03 19:45:44 · 3 answers · asked by wolfwood 2 in Science & Mathematics ➔ Mathematics
1260/180+2 or 9
2006-09-03 19:51:11 · answer #1 · answered by Mein Hoon Na 7 · 0⤊ 0⤋
If the number of sides of a convex polygon is n,
Then sum of Interior angles = 180(n-2) degrees; as (n-2) triangles can be formed in the interior whose angles,when summed, give sum of all interior angles of the polygon.
Hence, 180(n-2)=1260
Therefore, n=9
2006-09-03 20:51:16 · answer #2 · answered by An Indian guy 2 · 0⤊ 0⤋
The general rule is, starting with a triangle, whose angles total 180 degrees, each side that you add increases the total by 180 degrees (4 sides, 360 degrees; 5 sides, 540 degrees; etc.).
So,
total of interior angles = (sides - 2) * 180
and
sides = (total of interior angles / 180) + 2
2006-09-03 20:25:50 · answer #3 · answered by ? 6 · 0⤊ 0⤋