Question

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Answer 1

∠ ADC = 160°

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°