triangle() / Reference /

Right triangle trigonometry review (article)

High School Geometry Common Core G.SRT.C.6 Trigonometric Ratios - Teacher Notes - Patterson

Specials: Triangle Art Master Reference turntable with tonearm and cartridge - Audio Federation

Triangle of reference - Wikipedia

Special Triangles at a Glance

Triangles - Properties, Classifications Theorems Graphic Org/Reference Sheets

Castle Learning Reference

Maths in a minute: Triangle central

Medial Triangles

TriangleArt

TriangleConstruct—Wolfram Language Documentation

Reference Triangles - MathBitsNotebook(A2)