Explicație pas cu pas:
[tex]A + B + C = 180 \\ B=C = > A + 2B = 180[/tex]
a)
[tex]\frac{A}{B} = \frac{13}{6} = > A = \frac{13B}{6} [/tex]
[tex]A + 2B = 180 = > \frac{13B}{6} + 2B = 180 \\ 13B + 12B = 1080 \\ 25B = 1080 = > B = 43.2 \\ C = 43.2 = > A = 93.6[/tex]
b)
[tex]\frac{A}{B} = \frac{4}{7} = > A = \frac{4B}{7} [/tex]
[tex]A + 2B = 180 = > \frac{4B}{7} + 2B = 180 \\ 4B + 14B = 1260 \\ 18B = 1260 = > B = 70 \\ C = 70 = > A = 40[/tex]
