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Exterior Angle of a Triangle and Its Property

Find ∠CAD.

Question

Find $∠$ CAD.

102^{o}

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110^{o}

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180^{o}

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122^{o}

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Solution

The correct option is D $122^{o}$
An exterior angle of a triangle is equal to the sum of the opposite interior angles.
So by this property:
$71^{o}$ and $51^{o}$ .
So, $∠$ $C A D = 71 + 51$
$∠$ $C A D = 122^{o}$

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