What lines form acute or obtuse angles at point of intersection? - Quora

What lines form acute or obtuse angles at point of intersection

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What lines form acute or obtuse angles at point of intersection

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What lines form acute or obtuse angles at point of intersection

A geometric proof of the impossibility of angle trisection by

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What is an obtuse angle on a right-angled triangle called? Why does it exist if there are no obtuse angles in triangles at all? - Quora