A cross section is made by the intersection of a plane and a square pyramid at an angle either parallel or perpendic to the base. The cross section can be which of these shapes? Select three options. O square O triangle O trapezoid O circle O non-square rectangle

To diagonalize an nxn matrix a means to find an invertible matrix p and a diagonal matrix d such that a pdp d p ap or [1 3 dh epap 3 let a=-3 -5 -3 3 3 1 step 1: find the eigenvalues of matrix a "2's" step 2: find the corresponding eigenvectors of a step 3: createp from eigenvectors in step 2 step 4 create d with matching eigenvalues.