In the given figure AB is a chord of a circle with centre O and BT is a tangent. If $∠ A B T = 70^{\circ}$ , then $∠ A C B =$ ______.

35^{\circ}

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55^{\circ}

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70^{\circ}

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145^{\circ}

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Solution

The correct option is C $70^{\circ}$
$∠ A C B = 70^{\circ}$ (angles in the alternate segment are equal)

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