B - Origin of Trig, Area and Volume Formulas Last updated Oct 29, 2021 Save as PDF A.14 Highschool Material You Should be Able to Derive B.1 Theorems about Triangles Page ID89645 Joel Feldman, Andrew Rechnitzer and Elyse YeagerUniversity of British Columbia ( \newcommand{\kernel}{\mathrm{null}\,}\)