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Angle Sum Property

From the figu...

Question

From the figure find the measure of $∠ A C D$ .

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Solution

Since $∠ A C D$ is exterior angle of $△ A B C$ .
Therefore,
$∠ A + ∠ B = ∠ A C D$
$\Rightarrow ∠ A C D = 70 ° + 40 ° = 110 °$

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