Răspuns :
Intru-un triunghi mereu are 180 de grade in total
m<A+m<B+m<C=180
m<A+55+85=180
m<A=180-140
m<A=40
m<A=180°-(m<B+m<C)=180°-(55°+85°)=180°-140°=40°
m<A+m<B+m<C=180°
Intru-un triunghi mereu are 180 de grade in total
m<A+m<B+m<C=180
m<A+55+85=180
m<A=180-140
m<A=40
m<A=180°-(m<B+m<C)=180°-(55°+85°)=180°-140°=40°
m<A+m<B+m<C=180°