geometrytrigonometryparallelogramPythagorean Theoremtrig identitiesLaw of Cosines
Problem Statement
[BD] is a median of △ABC. m(ABD)=90∘, ∣AB∣=2, and ∣AC∣=6. ∣BC∣=?<spanclass=′latex−bold′>(A)</span>3<spanclass=′latex−bold′>(B)</span>32<spanclass=′latex−bold′>(C)</span>5<spanclass=′latex−bold′>(D)</span>42<spanclass=′latex−bold′>(E)</span>26