A. 110 $°$

B. 70 $°$

C. 80 $°$

D. 90 $°$

A.  $\widehat{B_2}$ = 60 $°$,  $\widehat{B_1}$ =  $\widehat{B_3}$ = 120 $°$

B.  $\widehat{B_1}$ = 60 $°$,  $\widehat{B_2}$ =  $\widehat{B_3}$ = 120 $°$

C.  $\widehat{B_3}$ = 60 $°$,  $\widehat{B_1}$ =  $\widehat{B_2}$ = 120 $°$

D.  $\widehat{B_3}$ = 60 $°$,  $\widehat{B_1}$ =  $\widehat{B_2}$ = 110 $°$

A. 120 $°$

B. 220 $°$

C. 110 $°$

D. 180 $°$

A. 100 $°$

B. 50 $°$

C. 120 $°$

D. 130 $°$

A. 72 $°$

B. 108 $°$

C. 100 $°$

D. 120 $°$

A.  $\stackrel{⏜}{B_1} = \stackrel{⏜}{B_2} = {100}^o$

B.  $\stackrel{⏜}{B_1} = {100}^o; \stackrel{⏜}{B_2} = {80}^o$

C.  $\stackrel{⏜}{B_1} = {80}^o; \stackrel{⏜}{B_2} = {100}^o$

D.  $\stackrel{⏜}{B_1} = {100}^o; \stackrel{⏜}{B_2} = {90}^o$

A.  $\widehat{B_1}$ =  $\widehat{B_2}$ =  $100°$

B.  $\widehat{B_1}$ = $100°$;  $\widehat{B_2}$ =  $80°$

C.  $\widehat{B_1}$ =  $80°$;  $\widehat{B_2}$ =  $100°$

D.  $\widehat{B_1}$ =  $90°$;  $\widehat{B_2}$ =  $100°$