They have the same ratio. imagine 2 similar triangle, the first one has one side of 8cm and another side with 10cm the second triangle is one side 4 cm and other side of 5cm the ratio of side of each similar triangle is the same 4/8 = 5/10 = 1/2
All angles on a triangle add up to 180. If it's a right triangle it would be set up like this: 90+3x-4=6x-5=180. You would subtract 90 from 180 and get 90 left. 3x-4+6x-5=90. Then you would add 5 and 4 to 90.....3x+6x=99. Then you add 3x and 6x then you would be left with 9x=99. Divide 99 by 9 and you get x=11.
