An angle cannot "share" a vertex and a side.
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You can't calculate any angle if all you know is one side of the triangle.
No. It's a central angle only if its vertex is at the center of the circle.
An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.An angle is formed when two lines meet (or cross). The vertex is the point where the lines meet.
Exterior and interior angles at the vertex of a triangle add up to 180 degrees
C