Question 977081
a=2
b=sqrt(3)
c=sqrt (7)
a^2+b^2=c^2

cos (2/sqrt (7)=0.7559
sqrt (7) is at least 2.6, so it can't be 0.99
cosine =40.89 degrees
sin (sqrt(3/7))=0.6547=40.89 degrees, which it should.

b must be sqrt (3)