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Several math problems in the first grade of junior high school
2∠b+∠B+2∠b+∠B+ 12 = 180,∠B=28,∠A=56? ,∠C=96? oblique triangle

∠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?