a=20
b=21
c=√21²+20²=√441+400=√841=29
a/SinA=b/SinB=c/SinC
20/SinA=29/Sin90
SinA=20/29≈ 0.6896
угол A = 43⁰36'
21/SinB=29/Sin90
SinB=21/29≈0.7241
угол B = 46⁰24'
a=20
b=21
c=√21²+20²=√441+400=√841=29
a/SinA=b/SinB=c/SinC
20/SinA=29/Sin90
SinA=20/29≈ 0.6896
угол A = 43⁰36'
21/SinB=29/Sin90
SinB=21/29≈0.7241
угол B = 46⁰24'