2007-01-09 10:41:02 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
360/20 = 18 sides
2007-01-09 10:49:09 · answer #1 · answered by edivine 4 · 0⤊ 0⤋
The exterior angles of a polygon add up to 360°. So the number of sides can be calculated as:
360/20 = 18 sides
2007-01-09 19:27:02 · answer #2 · answered by Northstar 7 · 0⤊ 0⤋
360 / 20 = 18 Sides
2007-01-09 18:49:16 · answer #3 · answered by ? 7 · 0⤊ 0⤋
Presumably, by "exterior" you mean the change in direction as you progress from side to side. Since the total change in direction to circumnavigate the polygon once is 360 degrees, it must have 18 sides.
2007-01-09 18:47:33 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Then each interior angle is 180-20=160 because they are supplementary
160=180(n-2)/n
160n=180(n-2)
160n=180n-360
20n=360
n=18
:) I did it the hard way!
2007-01-09 18:49:44 · answer #5 · answered by Professor Maddie 4 · 0⤊ 0⤋