M is the midpoint of PQ and N is the midpoint of PR, and O is the intersection of QN and RM, as shown. If QN is perpendicular to PR, QN = 10, and PR = 15, then find OR.
This is too easy!!!
ON = 1/3(QN) (Median theorem)
NR = 1/2(PR)
OR = sqrt[(ON)2 + (PR)2]
