Triangle Set 8 Inch 30/60 & 45/90,50 Pcs Pyramid Stands Painter's Painting Stands, Plastic Mini Cone Paint Stands, Reusable Painting Triangle Stands Set, High Strength Canvas Support ,Grade 11 Math: Vectors] im not too sure about question e, i dont know what concurrent altitudes mean : r/HomeworkHelp,Amazon.com : ALVIN 8-Inch Computing Trig-Scale Adjustable Triangle (ANLX708K), 8 inches : Office Products,Theorem of Pythagoras | The theorem of Pythagoras | Siyavula