Princeton Review Math 1 Practice 1余补角 inscribed angle

 

Actually, I use a calculator to calculate the result. But here is the better way 

1.73999= (1.739)100 = 128.8100

2799 almost 2800= (28)100=256100

3500= (35)100=243100

4400= (44)100= 256100

250100= (44)100