Jerome is writing a coordinate proof to show that the midsegment of a trapezoid is parallel to its bases. he starts by assigning coordinates as given, where rs is the midsegment of trapezoid klmn. since rs is the midsegment of trapezoid klmn, the coordinates of r are ( ) and the coordinates of s are (a+d, c).the slope of kl is 0.the slope of rs is 0.the slope of nm is the slope of each segment is 0, therefore, the midsegment is parallel to the bases. answer choices : a, b, c, da+b, a+d0, 1, 2