Straight Angle -- from Wolfram MathWorld
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.
Wolfram Precalculus Course Assistant on the App Store
Shape of y = 3x +2 in r - heta space
Regular N-gonal Right Antiprism: Application of HCR's Theory of
Angle -- from Wolfram MathWorld
Trigonometry -- from Wolfram MathWorld
Cone -- from Wolfram MathWorld
Regular N-gonal Right Antiprism: Application of HCR's Theory of
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Steinmetz Solid - From Wolfram MathWorld, PDF
Angle - Wikipedia
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Line -- from Wolfram MathWorld, line