Imagine two regular polygons,one with
sides, and the other
sides.
If the ratio of interior angle for Polygon101 to interior angle for Polygon102 =
,
what is the value of
if the ratio was in simplest form?
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I found 2 ways to solve this problem.
Way 1:
n = number of sides
α = interior angle
n × ( π − α ) = 2 π
α = π − n 2 π = π ( 1 − n 2 ) = π ( n n − 2 ) = n π ( n − 2 )
α 1 0 1 α 1 0 2 = ( 1 0 1 − 2 ) / 1 0 1 ( 1 0 2 − 2 ) / 1 0 2 = 5 1 5 0 × 9 9 1 0 1 = 5 0 4 9 5 0 5 0
Way 2:
There is actually a pattern!
Formulas:
First polygon's number of sides = f
Term y = 2 ( f − 1 ) × ( f )
{**Note that this is also the formula for triangular number!! where n = (f-1); refer to https://en.wikipedia.org/wiki/Triangular_number }
Term x = Term y - 1
Use them:
Term y = 2 1 0 0 × 1 0 1 = 2 1 0 1 0 0 = 5 0 5 0
Term x = 5 0 5 0 − 1 = 5 0 4 9