Question

în DABC m<B=55 m<C=85.Atunci m<A este​

Answer 1

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

Answer 2

m<A=180°-(m<B+m<C)=180°-(55°+85°)=180°-140°=40°

m<A+m<B+m<C=180°