Lutsen Ski

I skied and I've seen people say it was a little less than 45 degrees, but I think a more accurate slope is 65-80 degrees. The station said he had a score of 90%. I wonder if this means 90/100 or 90/10.

Believe me, 40 to 45 degrees from its very, very steep. 80 degrees is steep crazy. Sorry if I disappoint you, but it seems that your friend is right: 90% = 42 ΒΊ

percent slope means lifting / run. So 100% means the quality goes down hill 100 feet vertically in every 100 feet horizontal. This corresponds to an angle of 45 degrees.
You can follow this formula:

ATAN (/ 100 percent slope) = Degrees

ATAN is (100% / 100) = 45

Percent .. Angle
--------------------
10 ......... 5.7
20 ......... 11.3
30 ......... 16.7
40 ......... 21.8
50 ......... 26.6
60 ......... 31
70 ......... 35
80 ......... 38.7
90 ......... 42
........ 100 45
........ 110 47.7
........ 120 50.2
........ 130 52.4
........ 140 54.5
........ 150 56.3
........ 160 58
........ 170 59.5
........ 180 60.9
........ 190 62.2
........ 200 63.4
........ 210 64.5
........ 220 65.6
........ 230 66.5
........ 240 67.4
........ 250 68.2
........ 260 69
........ 270 69.7
........ 280 70.3

lol what is it?
http://www.youtube.com/watch?v=c1UrfFPoW ...

You can not even stop on a slope 65-80. 80 is a cliff ... (I wonder if anyone has skied at 80, actually) from 50 to 55 degree slopes are considered extreme terrain. There is certainly no slopes to 50 degrees in Minnesota.

lol he is groomed and you can not married by 50

Here are some slopes of 50 degrees:

http://www.youtube.com/watch?v=YlUioByED ...

need a helicopter to groom that ...