Quantcast XP Math - Forums - View Single Post - stuck on only these "easy" geometry questions?
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Old 07-27-2007   #5
Alvin P
Posts: n/a

1. A right triangle has a right angle, therefore there are only 90 degrees left in the triangle. so:3x-10+x=90 4x=100 x=25 other angle=-3x-10 3 times 25=75 75-10= 652. All the exterior angles added up equals 360. So....360/12=303. To find the total number of all angles in a polygon, it is # of angles minus 2 times 180(Number-2)180so(5-2)1803*180=54030+70+120+165=385540-385= 155