trigonometry - Getting an acute angle for an obtuse angle using law of Sines. - Mathematics Stack Exchange
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Right angle (90°); obtuse angle (more than 90° and less than 180°); acute angle (less than 90 degrees); and straight angle (an angle of 180°), vintage Stock Vector Image & Art - Alamy
Obtuse Angle: Definition, Types & Examples
Obtuse Angle: Types, Properties & Examples
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Obtuse Angle - Definition, Degree, Properties, Examples
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Obtuse Angle