Long Diagonals of a Regular Octagon

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The diagonals of a regular octagon with side length 'a'

The intersection of the diagonals, point I, is also the center of the incircle and circumcircle. Also, the diagonals divide the octagon into 8 equal isosceles triangles.

Expressions

Name Input
Diagonal Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image
Diagonal angle Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image
Side of an isosceles triangle Derive Input Maple Input MathML Input Mathematica Input Maxima Input Mupad Input TI-Nspire Input text Input Image