Tolong ya pake jalan :D​

1. 3a + 5a-12 = 180

8a-12=180

8a=180-12

8a=168

a=21

no 2 belum tau, maaf

Jawaban:

Geometri =

[22]

3a + 5a – 12 = 180

8a = 192

a = 24 (A.)

[23]

4x – 5 = 2x + 19

2x = 24

x = 12

AOC = 4x – 5

AOC = 4(12) – 5

AOC = 43° (C.)

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