Respuesta :

Answer:

160 degrees

Step-by-step explanation:

That is a straight line, meaning that the sum of a and 20 has to equal 180.

a + 20 = 180

a = 180-20

a = 160

160 degrees because it is supposed to add up to 180 so in that case you add 160+20 and it would equal 180 so a=160
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