Answer:
14.04
Step-by-step explanation:
Given triangles are congruent so we can find QR using similarity ratio of sides
ON/QR = MN/QP
5.2/QR = 8.1/21.87 cross multiply expressions
(8.1)*QR = (5.2)*(21.87)
8.1 * QR = 113.724 divide both sides by 8.1
QR = 14.04
