Step-by-step explanation:
[tex] \because \: ABCD=STQR...(Given) \\ \\ \therefore \: CD = QR \\ \\ \because \: QR = 21 \: in \\ \\ \huge \red{ \boxed{\therefore \: CD =21 \: in }}[/tex]
Answer:
CD= 21 in
CD is the same length as QR
QR= 21
