Question

please give the and.

Answer 1

(1)
$a - b = 80 ...(1)\\ a + b = 180....(2)(linear \: pair) \\ add \: both \\ 2a = 180 + 80 \\ a = 90 + 40 = 130 \\ from \: (1) \\ b = a - 80 \\ b = 130 - 80 = 50$

(2)
<1=<5=110


<2=<6=180-110=70...(linear pair)


<4=<8=60


<3=<7=180-60,=120... .(linear pair)
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