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julia-pushkina [17]
2 years ago
5

HELPPOOoPPpPppppppppppppp

Mathematics
1 answer:
AfilCa [17]2 years ago
5 0

Answer:

∠ ADC = 160°

Step-by-step explanation:

let ∠ CDB = n then ∠ ADC = 8n

The 2 angles are adjacent and lie on a straight line and sum to 180° , then

n + 8n = 180, that is

9n = 180 ( divide both sides by 9 )

n = 20

Then

∠ ADC = 8n = 8 × 20 = 160°

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