**Mathematics**

# Two lines $$AB$$ and $$CD$$ intersect each other at a point $$O$$ such that $$\angle AOC:\angle AOD=5:7$$. Find all the angles.

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**A.**$$100$$ -
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**A.**$${ a }^{ 2 }+{ b }^{ 2 }={ p }^{ 2 }$$ -
**B.**$${ a }^{ 2 }+{ b }^{ 2 }=\dfrac { 1 }{ { p }^{ 2 } } $$ -
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**A.**$$\displaystyle 90^{\circ}$$ -
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