Respuesta :

B) 40, knowing that DCA is 155 is helpful because then you can figure out angle C. 180-155 is equal to 25. Then, 115+25= 140. 180-140= 40

Answer:

B). 40

Step-by-step explanation:

m<ACB = 180 - m<DCA

            = 180 - 155

            = 25

m<B = 180 - m<ACB - m<A

       = 180 - 25 - 115

       = 40

Otras preguntas