Verified answer

Ответ:

102°; 77°.

Пошаговое объяснение:

[tex] \angle \: A + \angle \: B = 180 {}^{ \circ} \: ; \\ \angle \: C + \angle \: D = 180 {}^{ \circ} \Rightarrow \\ \angle \: B = 180 {}^{ \circ} - \angle \: A = 180 {}^{ \circ} - 78 {}^{ \circ} = 102 {}^{ \circ} ; \\ \angle \:D = 180 {}^{ \circ} - \angle \: C = 180 {}^{ \circ} - 103 {}^{ \circ} = 77 {}^{ \circ} .[/tex]