Respuesta :

itsbriofc

Answer:

A = 48

Step-by-step explanation:

Hello!

42 + 90 + a = 180

180 - 42 - 90 = 48

So 48 is A

neolights040916

Answer:

48

Step-by-step explanation:

42 + 90 + a = 180

132 + a = 180

a = 180 - 132

a = 48

the degree of a line is 180 so you would just have to the degrees that you already know in order to find the missing ones