In given figure, two of the angle are indicated. What is the measure of $∠ A C D$ ?

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Solution

Sum of angles of $△ l e = 180^{o}$
$∠ A + ∠ B + ∠ A C B = 180^{o}$
$70 + 60 + ∠ A C B = 180^{o}$
$∠ A C B = 180 - 130 = 50^{o}$
$∠ A C B + ∠ A C D = 180^{o}$
(straight line)
$50 + ∠ A C D = 180^{o}$
$∠ A C D = 130^{o}$

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