Right Angle -- from Wolfram MathWorld
A right angle is an angle equal to half the angle from one end of a line segment to the other. A right angle is pi/2 radians or 90 degrees. A triangle containing a right angle is called a right triangle. However, a triangle cannot contain more than one right angle, since the sum of the two right angles plus the third angle would exceed the 180 degrees total possessed by a triangle. The patterns of cracks observed in mud that has been dried by the sun form curves that often intersect in right
Isosceles Right Triangle -- from Wolfram MathWorld
Making MathWorld « The Mathematica Journal
What is convolution? - Questions and Answers in MRI
Google Pixel XL XDA Review: A Foundational Release for Google & Post-Nexus Android
Spherical Coordinates - Intel Community
45-45-90 and 30-60-90 Triangles
Lagrange's Four-Square Theorem -- from Wolfram MathWorld, four square theorem
Riemann Sum -- from Wolfram MathWorld
What Is Trigonometry?
Right Angle - Definition, Properties, Shape, Examples
Angle - Wikipedia
peel-like' point-sorting sequence advice - Grasshopper - McNeel Forum
Curve of occlusion Article about curve of occlusion by The Free Dictionary
Sphere-Sphere Intersection - From Wolfram MathWorld, PDF, Sphere
LSystem Wolfram Function Repository