This is a topic under mathematics.

Sub topics: Hyperbolic Geometry, Triangle

Computational Geometry

link.springer.comThe Shape of Space

goodreads.comFlatterland

goodreads.comMultivariate Calculus and Geometry

link.springer.comThe Planiverse

goodreads.comA Comprehensive Introduction to Differential Geometry, Vol. 1

goodreads.comThings to Make and Do in the Fourth Dimension

goodreads.comThe Fractal Geometry of Nature

goodreads.com