The side of a parallelogram has endpoints at (2, 1) and (3,5). The endpoints for the opposite side are (5,2) and (6, 6). What are the lengths and slopes of the pairs of opposite sides?

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?