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A straight angle is an angle equal to 180 degrees=pi radians. Two right angles make a straight angle, and two straight angles make a full angle.
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How to Identify Triangles
Tangent, Definition, Formulas, & Facts
Right Triangle -- from Wolfram MathWorld
Surface Of Constant Width, curve Of Constant Width, franz Reuleaux
Angle -- from Wolfram MathWorld
Spherical Coordinates - Intel Community
Conic Sections - Wakelet
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