1. A right triangle has a right angle, therefore there are only 90 degrees left in the triangle. so:3x10+x=90 4x=100 x=25 other angle=3x10 3 times 25=75 7510= 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(Number2)180so(52)1803*180=54030+70+120+165=385540385= 155
