∠A-∠B=20? ,∠A+∠B=90? ,∴∠B=35?
∠A+∠A+2∠A= 180? ,∠A=∠B=45? ,∴∠C=90? , isosceles right triangle
There is an angle of 50: if ∠A=50? , then ∠B=50? ,∠C= 180? If c = 50? , so ∠A=∠B=65?
If one angle is 1 10, then the two bottom angles are 35?