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  • 01-10-2020
  • Mathematics
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I need the answers I don't understand

I need the answers I dont understand class=

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taaaaan taaaaan
  • 01-10-2020
CBD = 54°


90°+9°=99°

99/11= 9 (4x+7x=11x)
x=9

9x7=63
63-9=54
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