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Lurifaxel · Answer 1 · 2021-09-16T11:31:10+0000

Answer:

36°

Explanation:

I’m assuming <AOC is a right angle.

6x-12+3x+30=90

9x+18=90

9x=90-18

9x=72

x=8

<AOB=6x-12=6*8-12=48-12=36°